BATHHOUSE Spa occupies the former Delano tower, now W Las Vegas, at the south end of the Strip and has been reworked as a co-ed spa where bathing suits are required in shared spaces. Amenities include a redwood sauna, a eucalyptus steam room, a cold plunge, warm and hot heated whirlpools, a relaxation lounge and an exercise room. Facilities open Thursday to Monday from 8:30 am to 5:00 pm and the day pass, sold to hotel guests, is $75 early in the week and $100 at weekends.