Tourists may flock to Miami to enjoy the sun, but every local knows the summer heat can wear you down. Thankfully, the city's spas offer restorative hydrotherapy services that are even more satisfying when it's scorching outside.At Exhale Miami—Miami New Times's pick for Best Spa in 2012—swimsuit-clad visitors rinse off under a warm-water wash before lying upon heated stones in the coed hammam. There, an aesthetician dissolves dry skin with a double exfoliation that includes an organic aromatherapy scrub. A cool shower rinses skin clean, and an aromatherapy mist seals in the moisture that results from the scrub.On the rooftop of the Delano South Beach Hotel, patrons catch ocean breezes and take in 360-degree views in Agua Spa's open-air lounge area. Guests can laze outside on lounge chairs and enjoy poolside massages and manicures, or they can head indoors to air out their pores with oxygen-infused facials.