Perched on the banks of the wide Swan River, Perth is one of the world's most isolated cities. Western Australia's capital sits between the Indian Ocean and the sands of the Nullarbor Desert. Perth's Sunset Coast is perfect for swimming. Fremantle's cafés and al-fresco eateries suit laid-back urbanites. Free CAT buses service tourist locations in Central Perth and Fremantle. Don't miss the ferry to Rottnest Island, home to charming marsupials called quokkas, or the views from King's Park and the Botanic Gardens.