Just finished my trip to South Island New Zeland last month...
Suggest you to go to South Island and you can choose to take the local ground tour package there.
- Kaikaora - whale watch (highly recommended)
- Mt cook/Tasman glacier
(There are quite a lot of activities you can take, like Jet boating, 4WD/Jet Safaries, Winery tour, TSS Earnslaw cruise/Walter Peak High Country Farm, etc)
- Milford Sound
Have a good trip..
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