Hiked around Rotorua (didn't have a bike available unfortunately) and I have to say that the landscape is like stepping back in time to a more prehistoric age. The only downside is that it kinda stinks of sulfur there (which you do get used to eventually) because the whole place is in the caldera of a volcano (great hot mud pools and impressive geysers). I thoroughly recommend the Hangi experience after a day on the trails, awesome tasty food.