I know this topic has been discussed at length but the more I read, the more confusing it seems to get to make a decision!
We are planning to see two spots on two different days, and it sounds like Wai-O-Tapu by most standards is the one not to miss if we had to only choose one.
They seem to be pretty amazing areas and if there isn't a lot of difference in the scenery to see between these three we may just stick with Wai-O-Tapu (we'll be spending one night in Taupo and also a night or two in Rotorua depending on this).
We're not normally big hikers and I think this would be the first time we've paid just to walk around somewhere (not that it's not worth the entry fee I'm sure - just isn't something we normally do on vacation), but since we're travelling all the way from Canada and have been waiting so long to see New Zealand, I just don't want to miss out on something unique.
So - if Wai-O-Tapu should be enough, some tips would be appreciated, or if Waimangu and Orakei Korako have some unique features (I think we'll be covered in terms of geysers/mud pools, so mainly after some beautiful scenery if we take on a second visit), some advice on which of the two to choose would be much appreciated!