Consider renting a car for the duration of your trip to comfortably travel across New Zealand. If you decide to take domestic flights between cities, take into account the time and cost of flying as it can add up quickly.
If you have more time, visit the stunning beaches of Abel Tasman National Park and the world-renowned Tongariro Crossing. If you have less time, skip the west coast glaciers and spend more time in Queenstown or Wellington.