The Pool at Indian Springs Calistoga

"Boccie ball and shuffleboard courts and a croquet lawn provide entertainment when you're not indulging in volcanic-ash mud baths or soaking in the toasty Olympic-size mineral-water pool"

"Don’t overlook the poolside eucalyptus steam hut, or the traditional Calistoga mud baths offered in the spa"

"At day’s end, favorite pastimes include snuggling up next to the poolside fireplace or taking an evening swim under starry skies"

"Guests can swim in the natural spring–fed pools — one Olympic-size, the other reserved for adults only — until midnight daily (seasonal hours may vary)"

"Huge hot-springs-fed swimming pool"

"The new cocktail bar and restaurant—terrace dining is, naturally, de rigueur, complete with string lights and a fire pit—make it a full-service resort (where even the minibar is included), so you don’t have to leave the picturesque grounds after a day spent between treatments and the pool"