"The Tata Harper Spa in San Francisco (the only spa of its kind) is tucked into the back of Credo, a clean beauty shop in Pacific Heights. They offer a variety of treatments using Harper's signature products, including hydration therapy, and even back facials, and in true Tata style, you'll snuggle up under a vintage quilt that's reminiscent of her Vermont farm. There's just one tiny room in the back of the shop, so book ahead, though they will take walk-ins."