The Kalalau Trail is a popular and dangerous.
It has valleys and cliffs on one side and the ocean on the other. The Kalalau Trail in the Na Pali Coast State Park is on the island of Kauai, Hawaii USA.
Here are some pictures of the trail:
The trail is 11 miles long one way.
Camping is not allowed along the trail. It is at Hanakoa and Kalalau with permit.