Lanai , Hawaii
Concierge.com's insider take:
Another four-wheel-drive destination, this eight-mile rocky lava beach is located down a long series of scenic switchbacks on Lanai's northeastern shore. The rusted concrete hull of the 1940s Liberty ship comes into view about halfway down the descent, as does the island of Molokai, a few miles across Kalohi Channel. Due to the unpredictability of these waters, the shallow coral reef just offshore has become the watery grave of several seagoing vessels since the 1800s. From the beach, you'll find trails to old lighthouse ruins and ancient rock petroglyphs.