This 2,000-acre state natural area reserve in the lee of Cape Kinau, on Maui’s rugged south coast, is home to bejeweled Ahihi Bay. It was here that Haleakala spilled its last red-hot lava into the sea, so the entrance to the ocean is sharp and rocky. Ease into the water to see brilliant corals and abundant fish. Fishing is strictly forbidden, and the fish know it; they’re everywhere in this series of rocky coves and black-lava tide pools. To get here, drive south of Makena and watch for signs. A state naturalist is often on-site to offer advice. Note: The Hawaii Department of Land and Natural Resources has temporarily restricted access to portions of the popular and heavily used preserve.