Fodor's Expert Review Spouting Horn

When conditions are right, a natural blowhole in the rocky shoreline behaves like Old Faithful, shooting salt water high into the air and making a hollow, echoing sound. It's most dramatic during big summer swells, which jam large quantities of water through an ancient lava tube with great force. Most sidewalk vendors hawk inexpensive souvenirs, but a few carry locally set South Sea pearls or rare Niihau-shell creations, with prices ranging from affordable to several thousand dollars. Look for green sea turtles bobbing in the adjacent cove.