Click on a sector or area on the map for a more in-depth view of that location. The Big Island of Hawaii offers much to be explored and discovered. The Big Island is 4,028 sq. miles, the biggest of all the islands. It is home to Maunakea, the tallest sea mountain in the world and Kilauea, one of the world's most active volcanoes. Take in a tour at Volcanoes National Park, enjoy a round of golf at one of the many courses or check out our Big Island snorkeling map for a beach near your next vacation rental.