Taking a trip to NZ

[Mc Fadge]

Planning a short trip to NZ with some friends around January next year, and was wondering if anyone had any suggestions for activities?

Landing in Auckland and and some point will be staying at my grandparents in Kinloch (near Taupo), so anything between and around this area would be great. We're going to stop in Rotorua for the Zorb stuff and the adventure park they have there (been before, that Swoop thing is awesome). Also hoping to do some paint balling (any suggested places?).

As a child, Rainbow's End was pretty fun, what's it like now? No doubt my memory has made it a bajillion times more expansive and amazing than it probably was/is