Do a South Island Great Walk p.300
There are any number of superb tramping experiences, but a few are iconic: the Queen Charlotte Track in Marlborough, the Abel Tasman National Park in Nelson, the Heaphy and the Wangapeka in north Westland, the Rees-Dart, the Routeburn and the Milford tracks in south Westland and the Hump Ridge Track in Southland are all justly internationally famous.