Laguna Grande Bioluminescent Bay

Laguna Grande is located to the east of San Juan in the town of Fajardo and it's one of three bio-bays found in Puerto Rico. The blueish glowing effect in the waters is caused by dinoflagellates— microscopic organisms that react to any movement in the water by activating their glowing defense mechanism. When planning your visit to this natural wonder, keep in mind that the glowing effect is better appreciated on moonless nights, the darker the better!

To visit the Laguna Grande, coordinate a boat or kayak tour with one of these tour providers:
- Kayaking Puerto Rico
- Pure Adventure