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If you want to see more than the City Center, you will probably need to rent a car.

Like in any developed country you have a wide choice of companies renting cars. Visiting all of them to get a price or conditions of hire will be an impossible task. Probably the most convenient way will be to find the best price and conditions will be via the Internet. See the links listed below.

relevant car rental links ...

Car Rentals Australia
Compare car rental prices in one easy system. Save time and money. Free online booking.

requirements and conditions for renting a car ...

• The minimum age to rent a vehicle is 18 years, but it can be higher and depends on the company and the state/country legislation.
• Maximum age to rent a vehicle is around 75 years, but it can be higher and depends on the rental company.
• In general, other individuals may be listed as additional drivers provided they met all conditions and complete an additional driver form.
• Valid driver's license written in English which will not expire during the lease for at least 12 months. The driving license must be a full licence one and must be issued from a country which is agreed by the company renting the car and the Australian authorities.
• Parking tickets or any fines are the responsibility of the renter.
• Unless you rent a 4WD, you must use the car on sealed roads only.

Note:
These are just broad requirements for renting a car. Please use the links provided above, to get the "fine print" of the terms and conditions. They differ from company to company, they are subject to changes, therefore is not possible to provide you with more than a few general guide lines.