Perth doesn't have too many 'sights to see' within the city, unless endless suburbia fascinates you. Three days in winter would be enough. Fremantle. The Coast. Perth City/King's Park. Done. If you're there in winter, get a car -or plan bus trips and head 50-400km away to the various Wineries / Jarrah Forests / Seal Watching etc... If you are 'stuck' in the city. Head for local galleries, coffee shops, bars, clubs - the people are friendly!

Margaret river wineries, wave rock, pinnicle desert. The only prob with going in winter is it will be too cold to swim in rottnest island!

Perth is wet and cool (about 16 degrees celcius). there are beautiful beaches and wineries to visit - depends on what you're interested in