I will do a full guide to Rotorua soon, but I had so much fun in the Redwood I wanted to share. The Redwood is South of Rotorua town and is perfect for two things: Hiking and Mountain biking.
I personally did the latter with the aid of an electric mountain bike, and had so much fun. The forest had trails from children to level 6. I am inexperienced in mountain biking and managed to get to a level 3 on the way up but going down I found it very difficult.
So why go? Views, a serious workout and some good old adrenaline