This is the 3rd time I have been at the Fairmont and visited the Well and Being or Willow Stream before the name change. I always go off season when the temperatures are in the triple digits (get the lower room rates this way). I have been able to figure out how to stay cool, be outside and enjoy all aspects of the spa. The facilities are so pleasant. The gym has some great state of the art equipment. The spa is separated men from women but the outdoor waterfall is coed as is the rooftop pool. The indoor area is amazing, the jacuzzi, cold plunge is in a circular domed area. Reminds me of Roman bath houses. I love the eucalyptus inhalation room. If you want to sit in the solarium, have a smoothie or lunch brought in, you can do that as well.
The treatments are amazing. I have had everything from the decadent over the top Haviusupai Falls. It starts with a salt scrub, bath, massage, and shiridara (warm oil slowly poured on your forehead into your hair). It is 2 hours of sheer bliss. Yes it is pricey but so worth it. I had the back soother: moor mud on your back for detoxing and then a heated jade stone and back massage. The reflexology was incredible as well.
I think going off season and mid week helps with giving a sense of quiet and privacy. I was told that peak season and weekends there are 20 people in the waterfall pool vs 3 when i was there.
Very worth it!