LOVE this spa! I've been here twice now and done a day pass both times. In the women's area they have a eucalyptus steam room, sauna, hot tubs, and cold plunge. The co-ed areas are the heated stone beds (quiet and so relaxing), salt room, and outdoor pool that looks over the Aria pools. You could easily spend 3 hours just enjoying the amenities here. I was staying in the Aria Sky Suites and as a hotel guest you can do a day pass any day of the week. Non-guests of the hotel are limited to Mon-Thurs unless you have a treatment. Speaking of treatments, I will definitely be getting one next time I go!