How long have you got over here ?
How much do you want to drive\travel ?
How much do you want to spend ? ( ie are you going all out or doing it budget wise ? )
What are your interests ?
What do you want to see ?
I'd suggest Milford Sounds, Queenstown, Otago if you want super scenic and Pinot Noir.
Rotorua, Tauranga, Taupo for scenic and cultural experiences.
Napier, Malborough\Nelson, Canterbury, Otago for wines.
Kaikoura for whales and crayfish.
Auckland for nightlife, food, beers, more wines (again), whales (again) sailing, boating, beaches.
Coromandel for beaches, fishing, bush walks ( although you can do that anywhere in NZ really ).
(I should be a tour guide
)