The central North Island sits on a geothermal belt — Rotorua, Taupō, Hanmer Springs (South Island) and Tekapō all have public hot pools fed from underground. Many are open until 10pm and most offer private spa rooms in addition to communal pools.
Rongoā Māori is the traditional Māori healing system, drawing on native plants (kawakawa, harakeke, mānuka) and the spiritual significance of place. Several iwi-led wellness operators offer guided forest walks, mirimiri (massage), and educational sessions.
Boutique day spas have opened in most major towns over the last five years — typically built around mānuka honey, native botanicals and stone treatments. Multi-day wellness retreats are clustered around Waiheke Island, Coromandel, Wānaka and Hawke's Bay.