You can apply for a COV (Certificate of Validation), it consists of a flight review which would require some training to pass (perhaps 10 hours in a 172 at $300 ph). The COV lets you fly in Aus with a foreign licence for 3 months, it is for pilots on holidays basically.
You would require an ASIC (Aviation Security Identification Card) if you were to fly in and out of security controlled airports.
I presume you have an English speaking standard printed on your licence, so would not need to sit the English test, you should also have a Flight Radio Operators License which should carry over (Printed on your licence)
You would expect to hire a 172 for approx $250 per engine running hour.
Most flight schools should be able to do your COV, as with everything in aviation, just be careful to not let them take you for a run.
Do your COV at the place you intend to hire from, saves you another check flight.
Recourses: Flight Instructor in AUS, NSW