Bush And Ocean Sanctuary In Auckland is a campground at Cornwallis, in the Waitakere area of Auckland, with a Google rating of 5.0.
Campgrounds vary a lot, so it helps to know what kind you are heading for. Some are simple paddocks with a toilet block and a water tap, while others have powered sites, hot showers and a camp kitchen. Ask before you book whether the site is powered, whether fires are allowed, and how far the toilets and water are from your pitch. In bush and coastal settings, bring insect repellent, a torch and a layer for cool nights, and pegs that hold in soft ground or sand. Mobile coverage can be patchy, so download maps in advance, and book early for summer and long weekends. Regulars keep food stored away from wildlife, take their rubbish home, and stay on formed tracks to protect the plants.
For anyone camping near the Waitakere coast, Bush And Ocean Sanctuary In Auckland gives a base at Cornwallis.