I can highly recommend Manuka Island eco cottage, at the end of a 1km long private road that goes over a bridge and a causeway right to the edge of the Waimea Estuary.
Run by just the nicest people, Belinda (a Specialty Clinical Nurse) and Graham (an outdoor skills trainer with a window cleaning business), the cottage we stayed in has everything you could possibly need.
Plus 2 excellent dogs.
Prepare to feel physically totally inadequate, though.
These 2 run triathlons before breakfast….