La Parguera, Lajas, Puerto Rico Bioluminescent bays require a certain ecological environment, including shallow tropical water like in Puerto Rico. La Parguera is best visited on a moonless night to view the shadowy glow.
Laguna Grande, Fajardo, Puerto Rico Laguna Grande is a tourist hotspot. The plankton in this region put on quite the show and when first spotted by Spanish sailors in the 17th century, they believed it was the devil causing the glow.