09R - Did it last January. 1 month flying around north & south islands. Really good experience. Great scenery & people.
Basically, turn up with your valid ICAO license, medical and logbook, do an equivalent of a BFT, get signed off and then NZ CAA will send you a temporary NZ validation permit (which is valid for up to 6 months), by return fax in my case.
Tauranga aero club had an old but half decent Arrow (ZK-RTE) which they let me take away for as long as I needed for a very reasonable rate.
Watch the weather, the fronts move in at an alarming rate!!
Have fun.