This behemoth of a spa at Caesars Palace bases its philosophy on the calming properties of water. Many of the treatments and special features here draw heavily on this element, beginning with the Roman Baths. Qua's social spa-ing concept of encouraging guests to verbally interact comes naturally when indulging in these three soothing baths. For guests suffering from heat exhaustion, the Arctic Room offers the perfect solution: snow falling from a glass sky. If traditional treatments bore you, consider visiting the Crystal Body Art Room. You won't completely experience Qua's water benefits until you've had a Vichy shower treatment that uses seven different showerheads called the Dancing Waters. Qua also has Men's Zone, a salon for men, and the Tea Lounge, where an in-house tea sommelier blends you a cup. Color, a phenomenal hair salon from colorist to the stars Michael Boychuck, is right next door. The Nobu Hotel flexes its influence with a whole series of treatments including the Nagomi Ritual with a welcoming foot bath, aroma nectars, and massage.