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St. Croix Bioluminescent Bay Kayak Tour

Guided ·
4.8
(535)
See all kayak tours in St. Croix
Kid Friendly
Locally Owned
Wildlife
Beginner Friendly
Free Cancellation
On the Water
Instant Book
Duration: 2 hours

Pricing

Adult - Transparent Sea Thru Kayak

Ages 18+ | Max Weight: 235 lbs per individual, 385 lbs combined

$70
Child - Transparent Sea Thru Kayak

Ages 8-17 | 1 Child per 1 Adult

$40
Adult - Sit on Top Ocean Kayak

Ages 18+ | Max Weight: 350 lbs per individual; 500 lbs combined

$55

All Prices

Adult - Transparent Sea Thru Kayak

Ages 18+ | Max Weight: 235 lbs per individual, 385 lbs combined

$70
Child - Transparent Sea Thru Kayak

Ages 8-17 | 1 Child per 1 Adult

$40
Adult - Sit on Top Ocean Kayak

Ages 18+ | Max Weight: 350 lbs per individual; 500 lbs combined

$55
Child - Sit on Top Ocean Kayak

Ages 8-17 | 1 Child per 1 Adult

$30

Description

Experience the Bio Bay of St. Croix - One of 7 in the world!

Paddle into one of the world's rarest natural wonders on this guided nighttime kayak tour of Salt River Bio Bay in St. Croix, U.S. Virgin Islands. Salt River Bay is one of only six or seven full-time bioluminescent bays in the world — and this tour gives you exclusive access to explore it from the inside, literally. Your guides offer the only see-through kayak tour at this bay, giving you an unobstructed view of the glowing water beneath you as billions of bioluminescent microorganisms light up with every stroke of your paddle.

The tour departs from Salt River Marina and covers 3/4 of a mile (1.2 km) to reach the bay. The tour typically begins near sunset, giving guests time to adjust their eyes to the darkness before arriving at the bay — where the real magic begins. Once inside, you'll have 45 minutes of free-roaming exploration. Unlike many other bio bay tours, this one lets you explore independently inside the bay rather than following a rigid paddling route. One guide is stationed at the bay exit for safety, while a second guide roams within the bay, available for questions or deeper dives into the science and ecology of what you're witnessing.

As your kayak skims across the dark water, you agitate billions of dinoflagellates — microscopic plankton that emit a bright blue-green glow as a defense mechanism. In a see-through kayak, the effect has been described by guests as "a thousand shooting stars at once."

Duration

  1. 2 Hours
  2. Please allow approximately 2.5 hours total including check-in, safety briefing, and gear fitting.

Location / Where to Meet

  1. Check in/Departure Address: Salt River Marina, 2100 Church St, Christiansted, St Croix 00820
  2. Please arrive 10 to 15 minutes before your scheduled tour time.
  3. Parking is available on site!
  4. Tours depart around nightfall; exact start time will be listed in your booking confirmation.

Ages & Requirements

  1. Minimum age: 8 years old
  2. Children ages 8–12 must paddle in a tandem kayak with an adult
  3. Maximum child-to-adult ratio: 1:1
  4. Maximum Weight for Transparent Kayaks: 235 lbs (106 kgs) per person / 385 lbs (174 kgs) per kayak
  5. Maximum Weight for Sit on Top Ocean Kayaks: 350 lbs (158 kgs) per individual / 500 lbs (226 kgs) per kayak
  6. The kayaks are two-person boats, and we must outfit the boats with two guests (unless you are a solo traveler or odd numbered party, then we have other options).
  7. No kayaking experience required
  8. Guests should be comfortable around water and able to follow guide instructions
  9. This tour requires 1.5 miles of paddling and, depending on conditions, may be very strenuous.
  10. All participants must be sober upon arrival

What's Included

  1. Guided 2-hour nighttime kayak tour of the Salt River Bio Bay
  2. Kayaks & Paddles
  3. Coast Guard-approved life vest
  4. Glow stick on each kayak for safety
  5. Pre-tour safety introduction and paddling demonstration
  6. Knowledgeable local guide with historical and natural history commentary
  7. DEET is nasty stuff, it is harmful to the bioluminescent organisms in the bay, and it melts our boats! We will provide a DEET free, Picaridin based insect repellent lotion for your convenience.  You’ll love it.

Not Included

  1. Gratuity - Never expected but if you have a great experience, please consider gifting 10-25% to your guides!
  2. Dry bag for personal items and electronics

What to Bring / Wear

  1. Swimsuit / Quick Drying Clothing
  2. Water shoes or sandals with straps
  3. Reusable Water Bottle
  4. DEET-free insect repellent — required
  5. Extra Layers of Clothing / Towels - Sweatshirts and Warm Hats
  6. Required paperwork — waivers and health/safety forms
  7. Waterproof Camera - The company is not responsible for any damaged or lost items.
  8. Please remove any jewelry, watches, or anything that can get lost or damaged by the water.

Wildlife Guidelines

Bioluminescence in Salt River Bio Bay is created by microscopic plankton called dinoflagellates. When their water is disturbed — by paddles, hands, or movement — they emit a bright blue-green glow as a defense mechanism. Please do not use any DEET-based repellents or lotions, as these chemicals harm the dinoflagellates. Apply any insect repellent at least 30 minutes before your tour to minimize transfer to the water. A 2014 study of bioluminescent bays identified swimming as one of the reasons that bio-bays crash.  So together with the other tour operators in Salt River Bay National Historical Park and Ecological Preserve, we have agreed to ban swimming in the bay. This is for both for your own safety, and to protect the organisms we are here to see

ADVENTURE PROVIDED BY Sea Thru Kayaks VI LLC.

FAQs

When is the best time to see the bioluminescence?

The bioluminescent intensity depends on weather conditions such as rain, tide, moon phase, sunlight, and many other natural factors outside anyone's control. Ideally, the best time to visit is around the new moon and during the drier months. That said, tours run year-round and guests have reported stunning experiences across many conditions. Your guides will give you the best available experience on the night of your tour — and if conditions are very poor (such as a very bright full moon), they will communicate this honestly ahead of time.

What is bioluminescence?

Bioluminescence in Salt River Bio Bay is caused by microscopic plankton called dinoflagellates (Pyrodinium bahamense). When their water is disturbed — by paddles, hands, or waves — they emit a bright blue-green glow as a defense mechanism. Salt River Bay is one of only six or seven full-time bioluminescent bays in the world and is currently being studied by the National Park Service and Dr. Michael Latz of Scripps Institute California.

Can we take pictures during the tour?

Yes, but with some limitations. Bioluminescence is notoriously difficult to capture on standard phone cameras or DSLRs without specialized settings and long exposure capability. Most guests find the experience is best enjoyed in person. Your guides are not responsible for any damaged or lost items.

Do I need to know how to kayak?

No prior experience is necessary. The majority of guests have never kayaked before. Your guides provide a short introduction and instructions before the tour begins. That said, guests in reviews note that having some basic experience or fitness does make the paddle more comfortable, particularly on windier nights.

Does my weight really matter?

Yes — weight limits are extremely important for both safety and kayak performance. The fully transparent “sea thru” kayaks are specially designed to maximize visibility into the water below, but because of their construction, they also have stricter weight limits than traditional kayaks.

For the transparent kayaks:

  • Maximum individual weight: 235 lbs (107 kg)
  • Maximum combined weight per kayak: 385 lbs (175 kg)

These limits help ensure the kayaks remain stable, responsive, and safe on the water. Overloading a kayak increases the risk of taking on water, reduced maneuverability, instability, or capsizing.

Transparent kayaks are generally configured as two-person tandem kayaks, and guests are paired accordingly unless you are a solo traveler or part of an odd-numbered group. If your group exceeds the transparent kayak limits, alternative kayak options may be available depending on availability:

  • Glass-bottom kayaks: up to 385 lbs (175 kg) combined
  • Sit-on-top kayaks: up to 500 lbs (227 kg) combined
  • Paddleboards: maximum 225 lbs (102 kg)

If guests arrive above the posted limits, participation in the transparent kayaks may not be possible, and guides may place guests into another type of kayak if available. These limits are strictly enforced for everyone’s safety.

For families with children:

  • Each child must ride in a kayak with an adult
  • Groups may not have more children than adults
  • If your group has more children than adults, please contact the outfitter before booking to discuss possible arrangements

Guests who voluntarily leave the tour early or who are unable to safely participate in a way that affects group safety may not be eligible for a refund.

Why can't I wear bug spray?

Don’t worry!  We’ve got you covered.  DEET is nasty stuff, it is harmful to the bioluminescent organisms in the bay, and it melts our boats! We will provide a DEET free, Picaridin based insect repellent lotion for your convenience.  You’ll love it.

Why is there an age limit?

Our main concern bringing small children on the tour is that they won’t be able to sit still for the entire tour, and will disrupt the enjoyment of others, since we can’t turn the tour around for only one party.  We’ve set our age limit at 5 years old.  However, if you believe that you have a little one that can handle the time on the water, and you can’t find a baby sitter – give us a call and we can talk about it.  We do have large “sit-on-top” boats that can handle three or four passengers (if one or two of them are small).  Just remember, this is an adventure tour with 1.5 miles of paddling. All children under the age of 13 must have a capable, fit adult in the kayak with paddling with them.

What happens if it rains?

Generally speaking, if it rains, we get wet!  Quick passing showers are one of the delightful things about the Caribbean, especially during certain seasons.  They are called diurnal showers and they frequently pass just after sunset.  If we anticipate widespread, pervasive, nasty, long ongoing rain, then we will cancel the tour.  We make this judgement call about 1.5 hours before the tour departs and send out emails and text messages to alert everyone.  Last year, this happened about four or five times, so it is very rare.   Typically the rain passes quickly, and the tour continues. Light rain does not affect the bioluminescence, and actually, adds a beautiful raindrop effect

Does it matter that I cannot swim?

No worries. All guests are required to wear a USCG approved personal flotation device.  These are comfortable paddling vests, once you get comfortable with them you will forget you have one on, and will want to wear it home.

Cancellation Policy

All cancellations must be made 48 hours prior to tour departure time for groups up to 5, and 72 hours prior to departure time for groups of 6+ for full refund.

If the customer requests to abandon the tour and return to the marina, or if a guide determines that a guest is unable to safely complete the tour for any reason, or if a guide determines that a guest is affecting the safety of the group, the guest will return to the marina, and no refund will be given.

Any guest who are no-shows, and any guest who do not arrive at the appropriate time will not be given refunds. Cancellations within 2 hours of the tour start will be considered "no-shows"

Weather happens. When the staff determines the weather or conditions are not safe, the tour will be postponed and/or cancelled. Refunds will be issued when tours are cancelled due to acts of god.

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Availability

October 2026

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Reviews

4.8
(535)
4.8 (535)

Location

Address

Salt River Marina

Christiansted, VI, 00820

VI

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