Private Fast Power Catamaran. Full or Half Day for Beach Hopping, Snorkel & Swim

Catch the best of the islands by boat. This private St. Thomas charter puts up to 12 people aboard MV Poseidon, a 36-foot TwinVee power catamaran built for quick crossings, steady cruising, and easy beach access. I like the custom route and the chance to stop for turtles, fish, coral, quiet beaches, or a drink at a waterfront bar. The included snorkel gear, water, soda, beer, ice, and park fees also simplify the day.

The main catch is cost. The advertised price is $895.50 for the whole boat, but fuel is extra at $8 per gallon, and a 15 to 20 percent tip is expected. I also would not book this expecting to visit every beach on the sample route. A full day may include only a few well-chosen stops, especially when seas are rough.

What makes this charter worth a closer look

• MV Poseidon carries up to 12 people privately, so your group does not share the boat with 30 or more strangers.
• The captain builds the day around you, with options for snorkeling, beach time, sightseeing, lunch, music, or beach bars.
• Turtle snorkeling is a real highlight, with frequent sightings at places such as Maho Bay and other spots around St. John.
• The low draft and rear ladder help with beach access, letting you get close to shore instead of making every stop a long swim.
• The fuel charge changes the final price, so calculate the likely total before you book.
• Half-day trips can feel short, while a full day gives you more room to relax and make longer crossings.

MV Poseidon gives your group room to spread out

The boat is a 36-foot TwinVee Ocean Cat with twin engines. That matters in the Virgin Islands, where you may spend part of the day crossing open water and part of the day easing into a sheltered bay.

The catamaran design offers more stability than a narrow single-hull boat. It is not a guarantee of a smooth ride, since wind and sea conditions can still make the water rough, but the wide layout gives you room to sit, move around, and stay reasonably comfortable. Several families found enough space for children and older relatives to enjoy the day without feeling crowded.

The boat is rated for up to 12 people. That is a useful size for a family reunion, wedding group, birthday outing, or two families traveling together. For a group of four, it will feel wonderfully spacious, though the price makes more sense when divided among several people.

A Fusion stereo lets you play music during the ride. That sounds like a small detail, but it helps set the mood during longer crossings. You can have a quiet morning, a swim-focused outing, or a more festive day with beach stops and music. The captain remains in charge of the route and safety, but the feel is much more personal than a standard sightseeing cruise.

A private route beats a fixed sightseeing schedule

Your captain starts with a safety briefing, then asks what your group wants to do. You can focus on snorkeling, spend more time on beaches, visit a resort for lunch, or combine several short stops.

That flexibility is one of the strongest reasons to choose this charter. Captain Glen, Captain Amanda, Captain Wallens, Captain Holly, Captain Aaron, Captain Mike, Captain Bryan, Captain Kyle, Captain Hillary, Captain Valley, and other members of the crew are praised for shaping the day around different ages and comfort levels. Captains are also described as engaging and well informed about local geography, aquatic life, and island history.

Still, flexibility is not the same as unlimited time. The listed places are possible destinations, not a promise that you will stop at all eight. One full-day outing reached three stops because the water was rough. That is normal boating math: every beach requires travel, anchoring, swimming, and getting everyone safely back aboard.

If your priority is snorkeling, say so clearly at the start. If one person wants a beach and another wants turtles, the captain can help find a workable balance. A little planning before departure will give you a better day than trying to squeeze in every name on a map.

Water Island is an easy opening stop

Water Island is listed as one possible first stop, with about 30 minutes suggested. Its value is less about checking off a famous beach and more about easing into the day.

You can use an early stop like this to get comfortable with the boat, test the snorkel equipment, or take a short swim before committing to a longer session. The captain can also use conditions at Water Island to decide how best to shape the rest of the route.

Thirty minutes is not long. If your group wants a slow beach morning, tell the captain you would rather stay put than collect several quick stops.

Little Buck Island is aimed at snorkeling

Little Buck Island is another possible 30-minute stop and is listed with admission included. The small-island setting makes it a natural choice for a swim and snorkel break.

The charter supplies snorkeling equipment, so you do not need to pack your own mask and fins unless you prefer familiar gear. The captain may direct you toward areas where fish and coral are more likely, but marine life is never guaranteed. One disappointing outing included turtles but fewer colorful fish than expected. That is part of snorkeling: water conditions, noise, visibility, and animal behavior all change from day to day.

The best approach is to treat the wildlife as a bonus, not a promise. Turtles have been seen regularly on these trips, along with tropical fish, stingrays, starfish, octopuses, and even a lemon shark on one outing. Those encounters are memorable precisely because they cannot be scheduled like a museum visit.

Secret Harbour offers a sheltered change of pace

Secret Harbour can work well when your group wants a calmer swimming stop. About 30 minutes is suggested, which gives you time to get in the water without turning the visit into a full beach afternoon.

A stop like this is useful for mixed groups. Strong swimmers can snorkel, while less confident swimmers can stay near the boat or simply enjoy the view. One captain helped a guest who was nervous about deep water feel comfortable enough to get in, a good reminder that you should tell the crew about concerns early.

Secret Harbour may not be the right choice if you want a long meal or extended time on shore. It is better understood as one piece of a custom boating day.

Honeymoon Beach makes beach access simple

Honeymoon Beach is especially practical for families and anyone who wants actual sand time. MV Poseidon has a low draft and a transom ladder, allowing the captain to bring the boat close to shore when conditions permit.

That design can save energy. Instead of swimming a long distance to reach land, you may be able to step or climb down near the beach. A family with a toddler appreciated being able to get close enough for the child to play on shore.

The beach stop also gives non-snorkelers something worthwhile to do. Not everyone wants to spend the whole day looking underwater. A parent can supervise a child on the beach while others snorkel, or the whole group can take a break from the boat.

Trunk Bay is a scenic choice, not a promise of a full visit

Trunk Bay is listed as a possible stop with admission included. It is one of the better-known beach names in the US Virgin Islands, but you should keep expectations practical.

A private boat day does not necessarily mean a long stay at every major beach. The captain may use Trunk Bay for a swim, a short look at the shore, or a decision point based on water and traffic. If you have your heart set on spending hours there, make that preference clear before leaving the harbor.

The same advice applies to any popular destination on the route. Ask the captain which places are best for the day’s conditions rather than insisting on a rigid checklist.

Scott Bay and Maho Bay are strong wildlife possibilities

Scott Bay is another possible 30-minute stop. It may be used as a swim, snorkel, or quieter anchorage depending on the captain’s plan.

Maho Bay is particularly attractive if sea turtles are high on your wish list. Several outings around St. John included turtle sightings there, and one family with young children managed to snorkel at three beaches, including Maho Bay. Even a non-adventurous older family member felt comfortable getting into the water at this stop.

That makes Maho Bay a good fit for groups with mixed confidence levels. You should still listen carefully to the safety briefing and ask about current conditions. The presence of turtles does not mean the water will always be calm or that every swimmer will see one.

Magens Bay is best treated as one option among many

Magens Bay is included among the possible destinations, with about 30 minutes suggested. Its inclusion gives you a chance to see one of St. Thomas’s most recognizable beach areas from the water or stop for a swim if the captain considers it suitable.

But adding Magens Bay to the day may mean giving up time elsewhere. The Virgin Islands look close together on a map, yet crossings, anchoring, swimming, and loading people back aboard take time. I would choose Magens Bay because it fits your group’s interests, not simply because it is famous.

Snorkeling is the strongest reason to book

The underwater time is the core appeal for many people. The boat carries new snorkeling equipment, and captains help match locations to the group’s interests and ability.

You might see turtles, coral, tropical fish, stingrays, starfish, an octopus, or other sea life. One group described the water around St. John as being like an aquarium, while another found a sunken sailboat among the attractions. These details show the range of possible encounters, but they are not guaranteed on every trip.

Your captain can choose better spots than you could find alone, especially if weather or water conditions change. That local judgment is valuable. It also means you should remain open to changing the plan. The prettiest name on the chart may not be the best snorkel site that day.

The charter works for beginners because the crew can help make the outing comfortable, but you should be honest about your swimming ability. The tour is water-based, and you need to be willing and able to participate in the boat and swim portions. Service animals are allowed, and most people can take part.

Beach bars and lunch add a welcome break

This is not only a snorkel trip. The boat can reach shore for drinks or meals at places such as Dinghy’s, Margaritaville, Lime Out, or other beach bars. Past outings have included a stop at Lovango for lunch and drinks.

These breaks can make a half-day feel more varied. You are not stuck in the water until everyone is tired, and non-swimmers get a proper shore activity. The boat’s low draft helps with access, though the exact stop depends on conditions and your captain’s plan.

Food and restaurant purchases are not listed as included. You receive water, soda, beer, and ice, but plan to pay separately for meals, cocktails, and other purchases on shore.

The price makes sense for a larger group

The base price is $895.50 for the entire boat, up to 12 people. At the full capacity, that is about $75 per person before fuel and gratuity. With eight people, it is about $112 per person before those added costs. For four people, the base cost is about $224 per person.

Fuel is billed separately at $8 per gallon. A half-day commonly uses 15 to 25 gallons, adding roughly $120 to $200. A full day commonly uses 30 to 45 gallons, adding about $240 to $360. The recommended tip is 15 to 20 percent, calculated as another significant expense.

The final bill can therefore be much higher than the advertised boat rate. For a group of 12, the charter can offer good value because you receive a private boat, a captain, equipment, beverages, and a custom route. For a small group, a shared excursion may cost less, but it will not offer the same space or control over the day.

You should also compare the half-day and full-day options honestly. Several people wished they had booked a full day, while another family found four hours just right for three children. Young children may reach their limit before adults do, so a half-day can be the smarter choice for families with small kids.

Timing, weather, and practical details

The meeting point is American Yacht Harbor on Smith Bay Road in Red Hook, St. Thomas. The boat returns there at the end of the outing. Arrive early, ideally 15 minutes before departure, so paperwork does not eat into your water time.

The activity lasts about four to seven hours, depending on the option you choose. Confirmation is sent within 48 hours of booking, subject to availability.

Good weather is required. If poor conditions cancel the trip, you can move to another date or receive a full refund. You can cancel for a full refund up to 24 hours before the local start time. Cancellations or changes inside that window are not refunded or accepted.

The charter has a strong overall record, with a 4.9 rating from 207 ratings and 97 percent recommended. The praise centers on the captains, clean and well-stocked boat, flexible routing, safety, and family-friendly attitude. The main complaints concern weather-related changes, surprise costs, short half-day timing, and the mistaken idea that every listed beach can fit into one outing.

Who should book MV Poseidon?

I would choose this charter for a group that values privacy and wants to control the pace. It is especially well suited to families, groups of friends, couples traveling with children, and anyone who would rather snorkel at two or three good spots than follow a fixed crowd schedule.

It is also a strong choice for a mixed group. Swimmers can look for turtles and fish, while others can enjoy the music, scenery, beach stops, or a drink on shore. Captains such as Holly, Amanda, Wallens, Glen, Aaron, and Bryan have shown a knack for keeping both children and adults involved.

I would be more cautious if your budget is tight, your group is small, or your main goal is to visit a long list of beaches. The extra fuel charge and tip matter, and rough water can reduce the number of stops. Snorkeling also depends on nature, so nobody can promise colorful fish at every site.

Should you book this St. Thomas boat day?

Book it if you want a private, flexible day on the water and can fill much of the boat. The best value comes with a larger group, especially when you care about having your own captain, your own music, and the freedom to change plans.

Choose a half day for younger children or a simple snorkel and swim outing. Choose a full day if you want lunch, beach time, several snorkel stops, and enough breathing room to enjoy the boat instead of watching the clock. Tell the captain your top two priorities, arrive early, and budget for fuel and gratuity.

If turtles, a good captain, and a private boat matter more to you than ticking off every beach, MV Poseidon is an appealing choice.

FAQ

How many people can ride on MV Poseidon?

The boat accommodates up to 12 people, and the charter is private for your group.

Where does the charter start and finish?

It starts and ends at American Yacht Harbor, 84GX+24H, Smith Bay Road, Red Hook, St. Thomas.

How long does the experience last?

The available outing lasts approximately four to seven hours, depending on whether you select a half-day or full-day option.

Is snorkeling equipment provided?

Yes. Snorkeling equipment is included, along with bottled water, soda, beer, and ice.

Is fuel included in the price?

No. Fuel is billed separately at $8 per gallon. A half-day generally uses 15 to 25 gallons, while a full day generally uses 30 to 45 gallons.

Can the charter visit the British Virgin Islands?

A visit to the British Virgin Islands requires a separate booking under Product Code 111649P25.

What happens if the weather cancels the trip?

If poor weather causes cancellation, you can choose another date or receive a full refund. You can also cancel up to 24 hours before the start time for a full refund.