Spa Castle NYC
131-10 11th Ave., College Point
This mini-chain of mega spas offers something called Sauna Valley: You’ll find every conceivable temple—gold, Himalayan Salt, infrared, far infrared, color therapy—and an equal number of pools to match. The Texas outpost is open twenty-four hours a day, while the Queens location is open from 6 a.m. to midnight, making this a fun pilgrimage (and a good girls-day activity). There’s an on-site cafeteria and even a kiddie pool.