City/Region: Rio Grande. The Caribbean Forest, 35 miles (56km) east of San Juan, is the only tropical rainforest in the United States National Park system and was named El Yunque by the Spanish. Its 28,000 acres contain about 240 different species of tree and numerous other plants from tiny wild orchids to giant ferns. Visitors can start their visit at the El Portal Tropical Forest Center where there are films, exhibits and interactive displays on the rainforest. Maps are available and you can choose from dozens of walking trails through the forest, graded according to difficulty. Nearby is Puerto Rico's best beach, Luquillo Beach, with is soft white sand and coconut palms.

Hours: Dialy 7.30am to 6pm. El Porto Rain Forest Center: daily 9am to 4:30pm.

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