Drivers license :
1) You can use your foreign license up to a year on your arrival. if you leave the country and come back, the clock is reset and you get another year.
2) Translation. You will only need the translation only if you want to convert to NZ license (atleast for Malaysian license which is reasonably readable). When i arrived, I was able to rent a car with just a Malaysian license. For Malaysian license, get it translated at JPJ which is very fast and costs only RM10.
3) If you plan to buy your own car and insurance, you should consider converting your license to NZ License. The insurance EXCESS is atleast additional NZD500 for Overseas license. Example, the insurance I took has an excess of NZD500. If anyone driving my car got into an accident and she is using an overseas license (and above 21 years of age), then the excess is NZD1000 (something like that - could be more).
4) We got into the Auckland Museum for free when we showed our NZ license which has a local address.