Went in April last year. Beautiful weather. just absolutely perfect. Walked the Tongariro Alpine Crossing and easily my most favourite experience ever. Whereabouts in NZ are you going?
Missed this, sorry.
Current plan is something along the lines of:
North Island:
Coromandel, Mt Tangaunui (as a base), Rotarua, Waitomo Caves
South Island:
Queenstown, Te Anau (as a base for Milford and Doubtful Sounds), one of the glaciers (Fox or FJ), a stop over en route to Kaikoura, Kaikoura, Blenheim.
Then fly back to Auckland and have a day there before flying home.
Any recommendations to add to the list?