If you wish to hire a vehicle best to arrange this online prior to your departure, all major vehicle rental companies operate in Australia. Vehicles can be collected at Sydney Airport.
REMEMBER - In Australia we drive on the left hand side of the road (the correct side of the road).
The Whitlam Centre has a large amount of parking available.
As it will be the Christmas Holidays in Australia and most industry and commercial business will be closed traffic should be light.