If you do not want to pay to fly between Australia's major cities, you have the choice if taking either a bus or train. Of the two, the bus is both faster and less expensive. Not only is the train slower than the bus, but expect to run into booking problems, especially around the holidays on popular routes. Night buses have guards, so you will always feel protected. Also consider taking a scenic cruise around the harbor.
Taxis are plentiful and fairly affordable, but there are several other choices for transport.
24-hour ATMs can be found throughout cities, and have fairly good exchange rates. Public phones are located all over Australia. Some accept coins, some accept phones cards, and some accept both. Australia has two telephone companies, Telstra and Optus. Australia's country code is 61.