I possibly bought a 'fake student ID' in a seedy bar in Thailand, it might have allowed me big discounts on travel all across Australia, but in NZ. nope, I'm sure it wouldn't have worked! (So take any real youth ID that you have) I rented a car, was allowed to go anywhere except one particular road on South Island. er...I eventually found myself on this road, sorry car rental company. It wasn't eaten by intelligent parrots, but I did meet these whilst staying in camping huts on South Island. Spoke French for two weeks after I picked up une Parisienne hitchhiking near Queenstown.
On the whole, I think I would've preferred to spend a year in Aus, with some of that as months in NZ, as opposed to the opposite. Aus was great, nothing tried to poison me, there was too much sunshine, but some part time work available.
listen to RNZ National program as an iPhone Android app, to get a feeling for their news. Try also Aus JJJ radio station. enjoy!