Check out Taupo / Rotorua for some fun outdoor activities, including waterfall hiking and skydiving (if you're into that sort of thing).
Want to do something uniquely New Zealand? Check out the Zorbing just outside of Rotarua. Also, I would check out the hot water beach in Coramandel. One of the best places to visit.
Also, the Te Paki sand dunes are definitely worth checking out. Sandboarding is sweet.
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