The Beach House, Kawau Island is an oceanfront bush cottage at 24 Vivian Bay on Kawau Island in the Hauraki Gulf, rated 4.6 on Google from 63 reviews. Visitors mention the setting, the private beach and the manuka forest walks, and the website describes self-catering stays reached by ferry from Sandspit.
Island stays depend on the ferry, so check timetables and book your crossing before you plan the rest of the trip. Self-catering means bringing food and supplies, so plan meals before you leave the mainland. Cancellation terms on island bookings can be strict, so read them before you pay.
For Auckland and Hauraki Gulf visitors who want a quiet beach stay away from the city, The Beach House on Vivian Bay is worth a look.