Polihale State Park
The longest stretch of beach in Hawaii starts in Kekaha and ends about 15 mi away at the start of Napali Coast. At the Napali end of the beach is the 5-mi-long, 140-acre Polihale State Park. In addition to being long, this beach is 300 feet wide in places and backed by sand dunes 50 to 100 feet tall. Polihale is a remote beach accessed via a rough, 5-mi haul-cane road (four-wheel drive preferred but not required) at the end of Route 50 in Kekaha. Be sure to start the day with a full tank of gas and a cooler filled with food and drink. Many locals wheel their four-wheel-drive vehicles up and over the sand dunes right onto the beach, but don't try this in a rental car. You're sure to get stuck and found in violation of your rental car agreement.
On weekends and holidays Polihale is a popular locals' camping location, but even on "busy" days this beach is never crowded. On days of high surf, only experts surf the waves. In general, the water here is extremely rough and not recommended for recreation; however, there's one small fringing reef, called Queen's Pond, where swimming is sometimes safe. Neighboring Polihale Beach is the Pacific Missile Range Facility (PMRF), operated by the U.S. Navy. Since September 11, 2001, access to the beaches fronting PMRF has been restricted. Amenities: parking; showers; toilets. Best For: walking; solitude; sunset.