Hundreds of thousands of bioluminescent dinoflagellates live in each gallon of bay water, and the light show put on by these tiny creatures provide is truly a (natural) wonder to behold.

A bioluminescent bay is a rare phenomenon that requires several ... Laguna Grande Bio Bay is in Fajardo, about 42 miles east of San Juan. Fajardo’s bio bay is the most visited in Puerto Rico.

U.S. News Insider Tip: Many visitors flock to Old San Juan for nightlife, but you'll find more locals in La Placita de Santurce, a farmer's market by day that hums with music, dancing, dining ...