1. Kalalau Trail, Kauai, Hawaii
There’s few places on Earth as lush and beautiful as this tropical oasis on the Nā Pali Coast of Kauai. Though the complete 11-mile trail is hardly for novices—the trail is at parts rugged and the frequent rains can make the paths slippery—the experience and views give it a top spot on many runners’ bucket lists. The full run offers riches worthy of their own day trips: sea cliffs, babbling waterfalls, white sand beaches and even ancient Hawaiian ruins. For those unprepared for the full experience, there are truncated two-mile and four-mile routes recommended as well.