Rotorua in der Stadt selber sowie in der naeheren Umgebung, Dampf, Schwefelschwaden, Thermaltümpeln und Geysire
Kaikoura whale watching, fur seals, delphins
Milford  
Otago Peninsula near Dunedin yellow-eyed and little blue penguins, royal albatross (the only mainland colony in the world), fur seals and a great variety of birds

Camping New Zealand has a good infrastructure for camping. If you continue to Australia, try to rent Campers at the same company to get a reduction (for example Brits)

hiking  
Thermalquellen  
wine