You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Caribbean National Forest (El Yunque) Along trail that goes from Hwy. 191 (Northern part) to Mt. Britton observation tower. About 7 min. hike up the trail Remove constraint Place: Caribbean National Forest (El Yunque) Along trail that goes from Hwy. 191 (Northern part) to Mt. Britton observation tower. About 7 min. hike up the trail