You can get on and off as often and for as long as you like. You just hail the next Explorer Bus that comes along. Three-day passes are available. Sydney also has great museums, both art and artifact. There are art galleries, churches and cathedrals, and some fabulous live theater.
Shopping is also high on the list for most travelers, and it's available here in abundance.
Australians love their sports. In winter there is Aussie Rules Footy and Rugby, both Union and League. You might even find the odd match of the World game, soccer. For an Aussie, there's nothing like mixing it up at a good club game and then getting on to the booze afterward. Summer bring s cricket, that weird game that is like a five-day baseball game on Valium.