My only problem with El Cielo at Sonoran Sky is that it's really hard to get a hold of them to make an appointment. You can call and call and call and they never pick up the phone. I also couldn't find a direct e-mail for them.
On the other hand, La Spa de Peñasco at Sonoran Spa has their own website and you can send your appointment request through the site and they send you back an e-mail confirmation.
I have been trying to find the name, phone number or website address for the spa at Las Palomas because that's where we're staying over the 4th, but haven't been able to find anything. I tried calling but they just keep disconnecting me - why am I not surprised?