Is Rotorua a good place to go for those who have limited mobility?

My family and I are taking a trip to New Zealand this April. We would like to see as much of the country as possible. One of the locations we are looking at is Rotorua. It looks from my readings however that many of the sights there are geysers and other places with geological activity. As such, I am worried that the trip might require a lot of walking or we will be going to places where it will be difficult for her to walk. Would anyone know if we should just pass on Rotorua or if ever, just take a daytrip there from Auckland?