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Spas are a major part of the Phoenix Valley's "pamper-me" culture. Eager to visit another resort’s spa? No problem – most have designated days of the week when non-guests can book treatments. Bonus: Treatment costs gain you access to spa facilities, which often include whirlpools, … more steam rooms, and fitness centers. Many area spas draw upon the area’s Native American heritage, infusing their offerings with local ingredients like desert mud, agave, blue cornmeal, and cactus blooms.