Napau Crater Trail to Makaopuhi Crater is a 11.8 mile moderately trafficked out and back trail located near Hawaii National Park, HI. The trail is only recommended for very experienced adventurers and primarily used for hiking. 11.8 miles 2043 feet Out & Back hiking Expand Map Sign up now to see this map! Reviews (0)Photos (5)Recordings (1)No one has reviewed this trail yet. Be the first!