After some time spent amid Sin City’s overwhelming sights and sounds, you might want to visit a Las Vegas spa. At The Venetian’s Canyon Ranch Spa—named one of the best spas in Las Vegas by readers of Condé Nast Traveler—guests can relax in one of nine themed environments such as the Salt Grotto and the Herbal Laconium before they even begin their treatments. The Luxor Spa, Nurture, offers an expansive service menu that ranges from a quick scalp and neck massage to a 3.5-hour Girls Night Out package. Staff members at the MGM Grand Spa and Fitness Center, meanwhile, administer everything from manicures to massages in 30 different treatment rooms.