El Yunque National Forest, Río Grande
Tel: 787 888 1880
Concierge.com's insider take:
The 28,000-acre El Yunque National Forest, the only tropical rain forest in the U.S. National Forest System, lies about 25 miles east of San Juan. It has dozens of well-marked trails (graded for difficulty) that lead to waterfalls, observation towers, and swimming holes. Most hotels arrange guided tours, but the park is easy to explore on your own, as there's only one major road. For a decent map or to talk with rangers about which trails you might try, stop at El Portal, the information center at the park's entrance. You can also catch a documentary here on the cotorras, the endangered indigenous green parrots that are slowly making a comeback.
Open daily from 7:30 am to 6 pm.