One of the contributions the Japanese made to Borneo during WWII, Poring Hot Springs has become a popular weekend retreat for locals. The complex is part of the Kinabalu National Park, but it's 43km away from the park headquarters, on the other side of Ranau, with its own accommodation options.
The hot springs are located in a well-maintained forest park with nature paths that the elderly and children can enjoy. The springs themselves are not natural puddles. Steaming (seriously, it's hot), sulphurous water is channelled into artificial pools and tubs, some of which feel a little run-down. It's a popular day-trip destination from KK, particularly for groups of mainland Chinese tourists.