Okihara
Make sure you understand the significance of Ebbie's mention of renter insurance. I'm not sure how things work in Oz but, if it's anything like the same as the UK, rental generally includes hull insurance. That is more often not the case in the U.S.A. The renter is usually expected to have insurance to cover the hull and possibly other risks. Another gotcha is, many smaller fields offer a "courtesy car" so you can explore the local area or get to and from a restaurant. You will almost definitely not be insured in that vehicle and it's almost impossible to get cover for any "loan" cars. It is the norm in the States that the driver is insured, not the vehicle as such.