Favorite thing: For different view of Southern Hemisphere life, make a point of visiting Antarctica while you're in Auckland. At Kelly Tarlton's Antarctic Encounter and Underwater World you can meet King and Gentoo Penguins in a world of real snow and ice.
Favorite thing: If you are travelling as a family with children, be sure to ask for family discount at any admission or transportation (buy an all day pass is your best bet if you are using public transportation). It is often less expensive than buying individual adult and child tickets.
Favorite thing: This is a fascinating place to visit. It also has the National Institute of Water and Atmospheric Research.