Australia's Great Barrier Reef is, of course, world famous, but there's some impressive snorkeling and diving on the west coast of the country, too. Not far from Exmouth, Ningaloo Marine Park was named a World Heritage Site in 2011. The protected area of 2,435 square kilometers (940 square miles) is home to an impressive array of marine life, from recently discovered sponges to sea turtles and manta rays. Gentle whale sharks and humpback whales inhabit the waters, as do dugongs, a cousin of manatees. If you want to stay dry while admiring the reef and its residents, glass-bottom boats at Turquoise Bay let you gaze at some of the 500 or so fish species and hundreds of coral varieties found here.