Fodor's Expert Review Kealakekua Bay State Historical Park

One of the most beautiful spots in the state, this underwater marine reserve has dramatic cliffs that 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 sleep and escape predators. There's very little sand at west-facing Napoopoo Beach, but this is a nice place to enter the water and swim (when the water is calm) as it's well protected from currents. At times, you may feel tiny jellyfish stings. There are no lifeguards, but there are bathrooms, a pavilion, shower, and (limited) parking. The Captain James Cook Monument, marking where the explorer died, is at the northern edge of the bay. Stay at least 300 feet from the shoreline along the cliffs, which have become unstable during recent earthquakes. A limited number of tour operators offer snorkeling and kayaking tours here, a good and very popular option.