Water activity

San Juan: Bioluminescent Glass-Bottom Kayak Tour by Night

3.4 / 5

5 reviews

San Juan: Bioluminescent Glass-Bottom Kayak Tour by Night

From US$ 105 per person

See an amazing bioluminescent bay through the bottom of a glass kayak on a nighttime tour in the Laguna Grande.

About this activity

Free cancellation
Cancel up to 24 hours in advance to receive a full refund
Covid-19 precautions
Special health and safety measures apply. Learn more
Mobile ticketing
Use your phone or print your voucher
Duration 6 hours
Check availability to see starting times.
Instant confirmation
Live tour guide
English, Spanish
Pickup included
Pickup from your hotel lobby in San Juan. The exact pickup time will be provided one day prior to the tour.
Small group
Limited to 8 participants


  • Take part in a nighttime adventure to a bioluminescent bay
  • Paddle your way through the waters in a glass-bottom kayak
  • Marvel at millions of glowing plankton in the water
  • Learn about this fragile and unique ecosystem from your expert guide
Full description
Embark on a nighttime adventure into the waters of the Laguna Grande and see millions of glowing plankton. Paddle in a two-person glass-bottom kayak (except on Tuesdays, when regular kayaks are used) for approximately 30-minutes through the mystical mangrove channels leading to the natural reserve of the Laguna Grande. See the microscopic plankton capable of producing natural light at the touch of your hand. Explore these amazing organisms up close as your professional guide takes you on a journey to discover all their secrets. Learn how this fragile and unique ecosystem maintains a perfect balance of life, and what you can do to protect such a special place. Paddle in this safe and closed environment, and watch as the water comes alive with millions of glowing plankton. Be aware that the bio bay is an unpredictable natural phenomenon that may be influenced by multiple factors. Bioluminosity levels can vary from very visible to minimal or none without any prior notice. The full moon phase may also affect the visibility of the bioluminescence. In the event of this happening, alternate methods such as the use of a tarp will be incorporated in order to appreciate it.
  • Pickup and drop-off from San Juan
  • Glass-bottom kayaks (except on Tuesdays)
  • Quality kayaking gear and equipment (small size for children)
  • Kayaking orientation and instructions
  • Commentary on the surrounding area and its flora and fauna
  • Gratuities not included but highly appreciated
Not suitable for
  • Children under 7 years
  • Pregnant women
  • People with back problems
  • People with heart problems
  • Wheelchair users
  • People over 264 lbs (120 kg)
  • People with recent surgeries
Covid-19 precautions
Safety measures in place
  • All areas that customers touch are frequently cleaned
Traveler requirements
  • You are required to bring and wear a mask
  • You will receive a mandatory temperature check

Select participants and date



Prepare for the activity

Important information

What to bring

  • Swimwear
  • Change of clothes
  • Towel
  • Comfortable clothes

Not allowed

  • Luggage or large bags
  • Alcohol and drugs

Know before you go

  • The maximum weight per person on a glass-bottom kayak is 185 pounds (83 kg), or 260 pounds (113 kg) for a regular kayak
  • Please specify in advance if you require a regular kayak
  • Due to strict weight restrictions, all participants will be weighed prior to the tour
  • No cancelations or refunds will be issued if an incorrect weight is provided
  • Glass-bottom kayaks are not available on Tuesdays due to maintenance; instead, the tour will be conducted on regular kayaks
  • Each participant must be capable of paddling on their own in a 2-person kayak and to sitting in the same position for about 2 hours
  • As participants will get wet, it is recommended to wear a bathing suit underneath your clothes and bring a towel and extra clothes for after the activity
  • Please travel light and only bring necessary items
  • Leave behind electronic devices, any important documentation like passports, large sums of cash or credit cards
  • Cell phones require waterproof cases
Customer reviews

Overall rating

3.4 /5

based on 5 reviews

Review summary

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Good tour to see the bioluminescent bay. A bit on the crowded side with multiple tours at the same time and the guides enjoyed yelling to each other throughout the tour continuously. Light kayak paddle through dark forest waterways was definitely the highlight other than seeing the glowing organisms with every paddle stroke in the water

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November 24, 2021

It gets real dark at night, so miners lamps would have been good to see by.

September 6, 2021

July 22, 2021

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Product ID: 400689