Visitors from Australia, Canada, United Kingdom, and the United States do not need an international driving licence. All others do. Avis, Hertz, Budget approx. Travelling by train. The rail journey from Auckland to Wellington takes around 12 hours and provides either a scenic day journey or a less scenic night service.
Meals are available on both services.
Cheaper fares can be arranged by booking in advance. More information can be found in Yahoo's New Zealand directory including Discover New Zealand Magazine.