This 11-mile trail is one of the most scenic and challenging hikes in Hawaii. Located on the rugged Na Pali Coast of Kauai, the Kalalau Trail offers breathtaking views of the Pacific Ocean, lush valleys, and towering sea cliffs. The trail is a strenuous hike,
From Wikipedia
The Kalalau Trail is a trail along Nā Pali Coast of the island of Kauai in the state of Hawaii. The trail runs approximately 11 miles (18 km) along the island's north shore from Keʻe Beach to the Kalalau Valley. The trail has been named one of the most beautiful, and dangerous, hikes of the United States.