Perth has 1.5 million residents and is, at least by area, Australia's biggest city. You can get to the CBD from the International (17 km away) or Domestic (12 km) terminals at Radcliffe by taxi (about 25 bucks) or shuttle bus, with a fee calculator at the website if you plan on long-term airport parking. Kings Park and Botanic Garden, the Western Australian Museum and Art Gallery of WA are all near Perth train station.