The north island town of Rotorua is filled with things to do. But first you must deal with the smell. The entire town smells like hot rotting eggs. . . this is because of all the geothermal springs in the area--geysers, mud pots, and the like. You actually get used to the smell by day two. But anyway, in Rotorua you can go to geothermal pools/springs, attend a sheep shearing "show" at the Agrodome, go to an authentic Maori feast/show called a "hangi," shop for all sorts of sheep related and general New Zealand souvenirs. There is also a big Maori cultural center with model villages and a lot of art, carvings, etc. Oh and of course you can go skydiving, bungee, and even roll down a hill in a giant clear ball. I think the Kiwis call this "zorbing"--who knows why? I didn't do it, but I must admit it looked pretty wacky.
Anyway, Rotorua is action packed. It might be a bit touristy and even a bit much for some, but alas, I went and thought I'd throw in my two cents on stinky, but interesting, Rotorua.