The best time to hit the mineral-fed pools at Indian Springs is just before closing, right around 9:30 p.m. Grab a float noodle, place it behind your neck, float on your back in the 102-degree water, and look up at the stars. No matter how cold the air might be, you will immediately relax. The Calistoga resort has been offering guests a similar experience for more than 150 years, though recent renovations have modernized the offerings and brought a new level of luxury and sophistication. The main attractions are the pools: one for all ages and another only for adults. Elsewhere on the property, an expansive spa offers massages and mud treatments; a restaurant—dubbed Sam’s Social Club—serves healthy California cuisine along with house-brewed beer. Accommodations vary widely, ranging from two-room cabins and expansive one-bedroom suites to multi-room bungalows and full-scale houses. Once you’ve had your fill of shuffleboard and bocce, walk into downtown Calistoga to shop at the local boutiques, or take the short trail to the top of the hill for a stellar view of the north end of the Napa Valley. Don’t miss: Perhaps the most spiritual part of the Indian Springs experience is the Wishing Tree in front of the spa. Write your wish on a card and tie it to the tree with the hundreds of others already there.