QT rules for adventure fun. Bungy, jet boat, mountain bike is the staple that time of year. Yes, its peak summer with the weather in the 80's. Food and wine in QT are stunningly good, if you are into wine there are great wine tours. It is a beautiful beautiful place.
I have got friends who live there with wakeboard boats, send me an email and I will put you in touch. If you are spending any time in the North Island let me know I can hook you up in Auckland and we have a lake house close to Taupo (central North Island)