Rotorua- adventure capital of NZ!
Such a great town- worth staying a week because it's a great place to hop over to other towns like Matamata and Waitomo, with Rotorua a great home base. Lots of fun places to eat and great souvenir shops.
Insider Tip:Raft the Kaituna or forever regret it and for souvenirs to go Penny's- she's super sweet and chatty and will tell you all the Maori legends. Also, if you need any supplies head to Mac Pac the staff is really helpful, and grocery shop at the Pak N Save, not Countdown. And the redwood forest is a great free hike!