City Circle Trams  is a free tram service that goes to most of the main attractions in Melbourne. It is very convenient and you can save on transportation and simply hop on and off from one destination to another: eg. Docklands, City, Aquriam, Parks etc etc. The old vintage look of the tram makes the ride very authentic. Services are also quite frequent. You can pick up a map of the tram routes from the airport or on board the trams itself.