Fodor's Expert Review Kealakekua Bay State Historical Park
This underwater marine reserve is one of the most beautiful spots in the state. Dramatic cliffs surround super-deep, crystal-clear, turquoise water chock-full of stunning coral pinnacles and tropical fish. The protected dolphins that frequent the sanctuary should not be disturbed, as they use the bay to escape predators and sleep. There's very little sand at west-facing Napoopoo Beach, but this is a nice easy place to enter the water and swim, as it's well protected from currents. There are no lifeguards; at times, you may feel tiny jellyfish stings. Stay at least 300 feet from the shoreline along the cliffs, which have become unstable during recent earthquakes.