This eco-conscious spa has reinvented the traditional Calistoga mud and mineral water therapies. Case in point: the hour-long "Mudslide," a three-part treatment that includes a mud body mask (in a heated lounge), a soak in a thermal bath, and a power nap in a comfy sound/vibration chair. The mud here is a mix of clay, volcanic ash, and essential oils. Traditional spa services—combination Shiatsu-Swedish and other massages, full-body exfoliations, facials, and waxes—are
available, as are fitness and yoga classes.