This resort offers open-air mineral pools and in-room mineral hot tubs. Parties and families of up to 20 people can book the Oasis Waterfall Lagoon by the hour. Advertisement ...

The resort offers a large pool and spa that are filled with heated natural mineral water pumped in from the ground. To soak in the pool for a day it'll cost you $14 per adult and $8 per child.

Sycamore Mineral Springs Resort and Spa, San Luis Obispo. This resort offers open-air mineral pools and in-room mineral hot ...