Ted
Heres where I reckon you should go-
Bay of Islands (3 hours drive North of Auckland) -Stay In Russell then visit Cape Reinga at top of the North Island.
Drive south of Auckland down the East coast via Tauranga to Mount Maunganui but avoid the Mount at New Years (its full of boy racers and teenagers ie like the Goldy on schoolies).
After that drive through to Rotorua (Rotovegas) lots of bubbling mud etc and cultural shows to showcase our indigenous inhabitants (ie the Black Poms tribal brothers
)
Then take a leisurely drive to Taupo with its nice Lake and scenery.But beware the dodgy Tow truck operators
South of Taupo you can head to the East coats and the Hawkes Bay which has a great amount of wineries etc.
Then finish in Wellington via the Wairarapa-go to Martinborough for more food and wine, or if you need to get back to Auckland, drive back up the West Coast via New Plymouth.
I am sure the other Kiwis will offer some more detail on the above.
If you have any issues when in the Auckland area feel free to contact me,I will be around and always available to help a VMX comrade.(+6421663430 Mobile)
Cheers
Craig