El Yunque National Forest is a tropical rainforest in northeastern Puerto Rico. From El Portal Visitor Center, a walkway winds through the surrounding treetops. Trails run to La Mina waterfall and Mount Britton, then up to the high-altitude dwarf forest. In the south are ancient petroglyphs, made by the area’s indigenous Taíno people. The forest comes alive with the nightly calls of coquí tree frogs.