Everyone forgets the Catlins!
I have been in NZ now for four years and the Catlins National Park and scenic drive from DUD to Invercargil is simply the most wonderous way to spend 3-4 days. But shhhhh dont tell anyone or they will ruin it.
With caves, walks on deserted beaches, preserved ancient forests and a calm down to earth attidtude it is simply gorgeous.
Do yourself a favour and get off the main tourist trails, there is only so much bungee jumping one can do (detached retina's and all).
For more information check out;
http://www.southernscenicroute.co.nz/
Mark