Spas with day pass in California

Calistoga, California

A 25-room Sonoma hotel in Forestville with a spa barn offering sauna, steam and pools, mainly for overnight guests.

Carlsbad, California

A hotel spa at the Sheraton Carlsbad Resort in Carlsbad, CA, open to hotel guests and via day pass, with an upscale price tier.

Big Sur, California

Adults-only hotel spa at Ventana Big Sur with ocean-view treatment rooms, outdoor cabanas for couples, and a 24-hour fitness and yoga space.