Embark on a nighttime adventure into the waters of San Juan's Laguna Grande and see millions of glowing plankton. Paddle aboard on this guided evening tour. Make your way through mesmerizing mangrove channels and learn about the wonders of bioluminescence. After getting picked up from your accommodation, head to Laguna Grande. Listen to a quick overview and safety briefing from your guide before setting out. Paddle in a two-person kayak 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 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.

Enjoy a night kayaking tour in the Bio Bay of Laguna Grande Reserve in Fajardo. An adaptive paddling program provides ample opportunity for creativity and many unique opportunities for anyone who would like to try kayaking for the first time.  The Bio Bay has microscopic organisms called dinoflagellates that produce a glowing effect when they are stirred by your paddles. Paddle your way through the mangrove forest for 2 hours, in the bioluminescent glow of the water.