Motuihe Island lies between Motutapu and Waiheke islands in the Hauraki Gulf. The island is a recreation reserve controlled by the Department of Conservation (DOC) and administered by the Motuihe Trust. It is a popular spot for day trips, accessible by 45-minute ferry trip from Auckland, and is known for its beautiful beaches.
meetupgeocachingauckland group on this trip + Sophie*Yorkshirekiwi83* 
I came over with the meetupgeocachingauckland group on a warm sunny summers day. It was a pleasant day. I got to lug around a ammo can for a number of hours before we found a likely spot.
Cache is a ammo can containing a hardcover logbook, 2 pencils, pencil sharpener, and about 5 matchbox toys.
This island is really nice and scenic. I recommend you visit.