South Island
anywhere north of Motueka is awesome, both coast and inland (Cobb Valley)
For tramping / nature etc Kahurangi north of Karamea is very nice. Lots of short walks, and very few people around.
West coast down past Haast (Jackson Bay is worth a look), thru Mt Aspiring park, on to Wanaka.
Fiordland, staying at Hollyford Valley - Guns Camp is a cool experience.
If you want to do a single boat trip - the one across Manapouri to the power station is well worth it, and on to Doubtfull Sound if time allows.
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