El Yunque Rainforest is the only tropical rainforest under the protection of the US Forest Service and also the largest nature reserve in densely-populated Puerto Rico. It is situated in the mist-wreathed Luquillo Mountains where year-round precipitation ensures lush, green landscapes and a healthy diversity of animal life. This includes mongooses, non-venomous snakes, the rare Puerto Rican Parrot and the Coqui frog whose distinctive croak provides El Yunque’s soundtrack.
El Portal Rain Forest Center provides a good introduction to the area. There you can pick up a map and set out on well-defined walking trails which will take you past such sights as the La Coca Falls and the observation points of Yokahú Tower and Mount Britton Lookout Tower.
El Yunque National Forest (formerly Caribbean National Forest), is in the northeast of Puerto Rico, less than an hour’s drive from San Juan.