Lidgard House is listed as a swimming pool on Kawau Island, in the Hauraki Gulf north of Auckland. It has a 4.7 rating on Google.
A good swimming pool is clean, well supervised and clear about its rules, with water that is comfortably warm and properly treated. A pool on an island is usually part of a private house or accommodation rather than a public facility, so it is worth checking in advance whether it is open to visitors and whether you need to book. Kawau Island has no bridge, so getting there means a ferry or water taxi, and it pays to check sailing times and the last boat back. Regulars know that bringing a towel, a hat and sun protection makes the day easier, that a shower before swimming keeps the water clean and that young children should stay within arm's reach. Follow any rules the owner sets, and take your rubbish with you.
For anyone visiting Kawau Island, Lidgard House is worth checking before you go.