We had a family rendezvous in Vegas and many have never heard of or experienced Vegas-style spa. Hotels have Spa???!!! They were in awe and it took some persuasion to get everyone to go.
Personally, it was a big disappointment because I had expected something to the grandness of the hotel. Instead it was a square room with only 4 or so recliners and 1 was taken up by a burly guy who was using it more like his "office". Total weirdo. The hot tubs were small, the steam/sauna was unbearably scorching hot, and no attendants.
The following day, we took everyone to QUA and all was good.