Clays, mineral salts, and plants gathered from the surrounding red-rock desert are used in all this spa's treatments and products.
Signature Treatment: During the Painted Desert Clay Treatment, warm, mineral-rich clay is brushed lightly over the skin, then brushed away when it's dried to reveal a tighter, deeply purified complexion (1 hour, $115).
800/237-1068; www.greenvalleyspa.com