Polynesian Spa is a geothermal bathing and day spa complex on the lakefront at 1000 Hinemoa Street, Lakeside, Rotorua, and the website calls it New Zealand's original geothermal bathing experience. It has 28 pools in four areas: Family Pools, warm mineral pools with fun-safe freshwater for children; Pavilion Pools, historic adult-only pools for visitors aged 12 and over, with foot reflexology; Deluxe Lake Spa, five premium pools with a cold plunge, heated recliners and views over Lake Rotorua; and Private Pools, 45-minute soaks with towels and changing rooms included. Day spa therapies are on offer, and the site suggests allowing about three hours for a soak, a treatment and time in the relaxation lounge. Combination packages pair the spa with Whakarewarewa Living Maori Village, Mitai Maori Village, Rotorua Canopy Tours and Velocity Valley.
The water is the reason the spa exists. Priest Spring is acidic and sulphate-rich, and the site says it was named after Father Mahoney, a priest who found relief from arthritis here in 1878. Rachel Spring is alkaline and rich in sodium silicate, and its water has been piped to the spa since 1902. The complex is cashless, with contactless payment in every payment area. A Deluxe Double Dipper for one person was listed from $117.95 as at 2026, and the spa is a well-known stop for anyone spending time in Rotorua.