Australia is a country surrounded by Indian and Pacific Oceans. It is also one of the seven continents of the world. The major cities of Australia include Sydney, Melbourne, Perth and Adelaide, which are all port cities. Australia has major tourist attractions which include natural as well as man-made. Some of the must-visit sites in Australia include Sydney Opera House, Bondi Beach, Great Barrier Reef, Sydney Harbor, Tasman National Park and the Great Ocean Road. You must also visit the Kangaroo Island, located near Adelaide, which has national parks having marine life and native wildlife including kangaroos. The cruise length can range from 2 to 40 days depending on the itinerary if its just within Australia itself or also going to/from New Zealand or South Pacific's neighbouring islands.