El Yunque or El Yunque Peak is a mountain located fully within the boundaries of the El Yunque National Forest, part of the U.S. Forest Service, which is the only tropical rainforest under the U.S. Forest Service jurisdiction. It is located in the municipality of Río Grande.
It is accessible via Mt Britton trail near the end of PR 191, which starts in PR 3 in the small town of Palmer. The best access from San Juan is via PR 66 toll express in 1 hr. which exits to PR 3. At the end of PR 191 in El Yunque there is a loop that goes to the entrance of the Mt Britton trail - close to El Yunque peak. It is one of the few places close to this trail with about 15 parking spots.
Wikipedia https://en.wikipedia.org/wiki/El_Yunque_(Puerto_Rico)
Address 00745, United States
Coordinates 18°18'42.831" N -65°47'35.587" E