Explore karst topography and subtropical vegetation at the 2,357-acre Bosque Estatal Guajataca between the towns of Quebradillas and Isabela. On more than 46 walking trails you can see 186 species of trees, including the 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 entrance to the forest 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 the official closing time.) A little farther down the road is a recreational area with picnic tables and an observation tower.
Rte. 446, Km 10, Isabela, 00662, Puerto Rico