I used to live in Kerikeri (Bay of Islands, NZ Far North) and fly from NZKK. It was occasionally used as a point of entry and departure by arrangement with the authorities. There is a small terminal building which is only open for Air NZ flights. The flying club was practically in active. There is Avgas on field, no resident LAME.
The flight down from Cape Reinga to Kerikeri is beautiful. You'll see some of the whitest sand in the world.
The airport is close to town and rental cars are on hand. Kerikeri is a cute little town with a good choice of hotels/motels. Down the road are tourist towns of Pahia and Russell (both beside the Bay of Islands). Plenty to do here for a couple of days.