One of the North Shore’s almost-too-beautiful beaches, named for the underwater caverns and lava tubes in and among the near-shore reef. In summer, this is among the best snorkel spots on the island. It's also the North Shore’s most popular dive site. In winter, however, the swell picks up and the surf can be heavy.
In the shoulder season, the snorkeling can still be decent, but always use caution and check with locals or lifeguards before heading into the water. Beware especially of a regular current flowing west toward the open ocean. If you can't score a parking spot at one of the two unmarked lots down short dirt roads, park at Haʻena State Park and walk.