The Big Island (officially named Hawaii) is the largest island in the United States’ Hawaiian archipelago in the Central Pacific. Its diverse terrain spans colored-sand beaches at Papakolea (green) and Punalu’u (black) to lush rainforest. Within Volcanoes National Park, there are 2 active volcanoes, Kilauea and Mauna Loa. Hapuna Beach and Kahalu’u Beach Park in the west are popular snorkeling sites.. Hawaii is all about the sun, the sand and the surf. You can lose yourself in the exotic locations with crystal clear beaches and coral reefs that will make you do a double-take underwater.