Fodor's Expert Review Guajataca Forest Reserve

Explore karst topography and subtropical vegetation at the 2,357-acre Guajataca State Forest, between the towns of Quebradillas and Isabela. On more than 46 walking trails you can see 186 species of trees, like royal palm and ironwood, and 45 species of birds—watch for red-tailed hawks and Puerto Rican woodpeckers. Bring a flashlight and descend into the Cueva del Viento (Cave of the Wind) to find stalagmites, stalactites, and other strange formations. At the forest entrance there's a small ranger station where you can pick up a decent hiking map (get here early, as the rangers don't always stay until closing time).