Bioluminescence Bay snorkeling in Grand Cayman at night

Thousands of sparkling plankton light up around you in the dark water

Snorkel in Grand Cayman's Bioluminescence Bay on a 2.5-hour evening boat trip where you swim among glowing plankton that flash bright with each movement. A guide takes you by boat to the bay, then you enter the water with a snorkel mask to watch the ocean sparkle like a starry night. Wetsuits, snorkeling equipment and refreshments are included.

Step-by-step itinerary

Evening bioluminescence boat tour

• Boat ride to bioluminescence bay
• Swim and snorkel in ocean
• Observe sparkling plankton

The experience

Bioluminescence Bay sits among only a handful of places on Earth where you can see this phenomenon, and Grand Cayman ranks as one of the best. The bay comes alive after dark: millions of dinoflagellates, single-celled organisms, glow when disturbed, so every kick, every hand movement, every breath sends ripples of bright blue light across the water around you. The boat ride out takes just a few minutes, then you slip into the ocean with your snorkel mask and become part of the display.

The 2.5-hour tour runs only in the evenings and nights, when the bioluminescence is visible. You'll wear a wetsuit and have access to snorkeling equipment. The operator provides pool noodles, bottled water and soda. A live English-speaking guide leads the experience and stays with your group throughout. The water itself is calm in the bay, and the guide times the outing so you get the full effect of the glowing plankton against the dark sky.

What’s included

• Snorkeling equipment and wetsuits.
• bottled water and soda.
• pool noodles.
• a live English-speaking guide for the full 2.5-hour outing.

Before you book

Days and timesMonday to FridayDeparts at 18:15

GroupPrivate

Live guideEnglish

Meeting point and pickupNo hotel pickup: you go to the meeting point. Ends back at the starting point.

Cancellation and refundsFree cancellation up to 24 h before the start. After that, no refund.It may be canceled due to bad weather. If that happens, you're offered another date or a refund.

ConfirmationConfirmation within 48 h

Prices and times updated yesterday

Good to know

Moderate physical effortPets welcomePublic transport nearbyNot recommended with heart problemsNot recommended with back problemsInfants must sit on laps

Operated by Black Tip Charters

Is this one for you?The guide speaks English throughout, so you'll hear the explanation of what you're seeing and how to move safely in the bay. You'll need a moderate level of physical fitness to swim and snorkel comfortably, and the outing is not recommended for travelers with spinal injuries or poor cardiovascular health.

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Top questions

What happens if it rains?

It may be canceled due to bad weather. If that happens, you're offered another date or a refund. Free cancellation up to 24 h before the start.

What exactly is bioluminescence and why does it glow in Grand Cayman's bay?

Bioluminescence is light produced by living organisms. In the bay, millions of dinoflagellates, microscopic plankton, emit a bright blue glow when the water around them moves, so your swimming, snorkeling and hand movements trigger the light display all around you.

Do I need to know how to snorkel before I book this?

No prior experience is required. The operator provides snorkeling equipment and a guide who will be with you throughout the 2.5-hour outing. You'll enter the water with a snorkel mask and can move at your own pace in the bay.

What time of day does this tour run?

The bioluminescence tour runs only in the evenings and nights, when the glowing plankton are visible. The full experience takes 2.5 hours from start to finish.

What should I wear and what gear is provided?

Wear comfortable clothes you don't mind getting wet. The operator provides wetsuits, snorkeling equipment, pool noodles, bottled water and soda. You'll change into the wetsuit before heading out on the boat.