Bioluminescent Bay Adventure in Grand Cayman
Overview
Available languages
3 hours
Mobile ticket
Join us for an unforgettable evening as you witness millions of tiny plankton illuminating the waters at night. This exclusive boat tour features an evening swim in the glowing waters, guided by local experts who unveil the bay's hidden secrets.
Our adventure includes two incredible stops: first, visit the iconic Starfish Point, where you'll learn about the intriguing upside-down jellyfish. Then, dive into the wonders of Bio Bay, choosing to marvel from the boat or take an optional swim to experience this natural phenomenon up close. Don't miss this unique adventure—it's a must-do on your Grand Cayman getaway!
Additional Info
Wheelchair accessible
Infants and small children can ride in a pram or stroller
Infants are required to sit on an adult’s lap
Not recommended for travelers with spinal injuries
Suitable for all physical fitness levels
Flotation devices for children under age 3 are not available
Travelers must bring their own towel
Tour start times may vary seasonally to ensure you have the best experience possible.
The total tour time includes travel, with the Bioluminescence Tour lasting 2 hours from dock to dock.
Images are for illustration only; your actual experience may vary, highlighting the enchanting unpredictability of bioluminescence.
Tours are scheduled around moon phases, so availability may change.
Cancellation Policy
For a full refund, cancel at least 24 hours before the scheduled departure time.
What To Expect
Starfish Point
Enjoy a scenic 40-minute drive from your accommodation to the stunning East End. Your first stop is the breathtaking Starfish Point, the ultimate sunset attraction in the Cayman Islands. Here, you'll receive an insightful briefing about the unique upside-down jellyfish before heading to the famous Bio Bay. Dive in and swim (optional) as you marvel at the enchanting bioluminescence.
Bioluminescent Bay
Experience the enchanting bioluminescent bay at Cayman Kai, where nature glows under the night sky. Join our local experts for an unforgettable adventure as each splash ignites millions of shimmering plankton, creating a breathtaking, starry sea around you. This tour is a must-do during your Cayman Islands getaway! Don’t miss the chance to capture stunning photos in these pristine waters!
What‘s Included
Water and fruit punch
Certified captain and crew
Snorkel set: Fins, snorkel and mask
Roundtrip Transportation from Seven Mile Beach hotels
Life vest
Entrance fee to the Marine Park of Cayman Islands
Air-conditioned vehicle
Snacks
Gratuities
Transportation outside the Seven Mile Beach area
Pickup points
Select a pickup point
Options
Bioluminescent Bay Adventure in Grand Cayman
Pickup included
Reviews
11 reviews
Total reviews and rating from Viator & Tripadvisor
Beautiful evening
Kathleen S,Mar 20, 2026
- Review from Viator
5.00The captain and crew were amazing! Their technical expertise coupled with their sense of humor were awesome! The ship was very nice! It was great fun to be out on the water after dark!
Great crew; meh on the glowing
655jeanniea,Feb 10, 2026
- Review from Tripadvisor
3.00The captain and the crew were exceptionally knowledgeable and kind, and the boat was lovely and comfortable. However, the bioluminescence looks nothing like that promotional photo and it feels slightly deceptive to advertise it that way. The glowing in the dark is much more subtle and barely noticeable from above. On our night, the air and water were very cold and not inviting, and the "wetsuits" do not provide warmth, but rather only protection from jellyfish. The stars were spectacular, but the bioluminescence was underwhelming.
Cool experience
William L,Aug 28, 2025
- Review from Viator
5.00I was questioning if this would be worth the money, but it was 100% worth it. The Bio bay is a very cool experience that everyone needs to do. Make sure to use the snorkeling gear provided as it adds a whole other level to it.
The crew and the boat...
Natalie W,Jun 30, 2025
- Review from Viator
3.00The crew and the boat were fantastic. The cost for the experience was overpriced . For what little time that we had .The email that we received was for one spot to meet at and it was wrong . So not very good communication as well . All of the people on board said the same thing about how they didn’t know were to go .. Other that that the guys that were the crew members they were awesome.
Unforgettable Experience!
505parkerj,Apr 21, 2025
- Review from Tripadvisor
5.00Amazing experience! The crew was friendly and knowledgeable and the experience was unforgettable. Swimming in the bioluminescent water was one of my all time favorite experiences that I will never forget. 10/10
Nighttime experience in Grand Cayman
Jerald C,Feb 3, 2025
- Review from Viator
5.00Great experience and crew that we very educated about the experience. Great nighttime activities too
Expensive “boat ride” & HUGE disappointment!
GW R,Jan 25, 2025
- Review from Viator
2.00We were HIGHLY disappointed after paying $270 for a “boat ride.” We thought we were going to cruise to see colored bioluminescence. We couldn’t even photograph the saltwater-colored plankton. After more than 2 hrs on the boat, the demonstration lasted about 20 mins with someone splashing around in the water. The crew was super and the skipper was shocked when I showed him the website photo of what we THOUGHT we were going to see. BIG disappointment! He said he spoke with his supervisor (apparently by phone) and to expect a phone call, today. NO ONE ever called. DON’T was your money!
Great tour but could be a little better
william b,Jan 25, 2025
- Review from Viator
4.00The only way you see the bioluminescence and the plankton is by swimming with them. If you don’t want to get in the water this tour is not for you. I had a fun time and enjoyed myself.
Great boat trip but not much bioluminescence
Donna C,Jan 18, 2025
- Review from Viator
4.00We went on this tour in January 2025. The staff on the boat were fun, friendly and informative! The boat was nice, clean, and comfortable! We saw very little bioluminescence and it wasn’t like it was shown in the listing. Perhaps the jelly fish were not in that location when we went.
Family was disappointed
domenicMale t,Jan 5, 2025
- Review from Viator
2.00The staff were fantastic and I think they even felt badly that the experience wasn't great. The starfish and jelly fish part of excursion took away too much time in the bay. Perhaps since it was the day of these tours the luminous part wasn't that great.
From US$139.00
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