New Zealand has magnificent scenery and some of the world's best trekking. If that interests you, check out http://www.doc.govt.nz/parks-and-recreation/tracks-and-walks/ over 5 years ago
Queenstown is quite touristy and seems to attract a lot of the younger crowd looking for work and a decent social scene and is the liveliest place I have seen. Depends how long you have. Get a car if you can and start at the top of south island and drive around and through to see the main points of interest - there aren't so many roads to chose from and places of interest are well marked and you will find hundreds of options on the way, over 5 years ago
NZ has got the best of nature. I would highly suggest you to enjoy the natures goodness.I use a mobile app that tell me about the attractions, free activities, places to visit and so much more.
You can check it out at: https://play.google.com/store/apps/details?id=com.hummba.guide.newzealand
If you are an iphone User:
Enjoy your stay :)
Hope this helped! over 5 years ago