Hotel Nikko San Francisco, at 222 Mason Street in Union Square, has a 10,000-square-foot wellness centre with a glass-enclosed heated indoor pool, hot tub and a health club with cardio and strength equipment. Separate men's and women's locker rooms each contain a dry sauna and a steam room. The hotel describes the facilities as being for registered guests, but day passes are sold through ResortPass from $56, with pool access 9 AM to 5 PM and health club access 7 AM to 5 PM.