Agree with OP, there is loads to do so get a car. We travel a lot with the kids and I'd recommend at least a Commodore or Falcon. We actually tend to get a Ford Territory or similar for the extra room. Most companies charge about $8 - $10 per day per car seat so we just take the girl's seats. DD1 (now 3) sits in her seat on the plane but we usually fly Qantas and it's allowed (although not common) on most their planes. They also allow car seats to be checked in free of charge in addition to their baggage allowance so it's really not an issue to take them.