For years, Canyon Ranch has been the gold standard in the spa industry, known for its innovative approach to healthy living. The focus here is on fitness, nutrition and stress management. This 65,000-square-foot facility has the largest fitness center on the Las Vegas Strip and includes cutting-edge fitness classes, state-of-the-art equipment and a 40-foot rock-climbing wall. After a vigorous workout, reward yourself with one of the spa’s massages (from neuromuscular therapy to Thai) or body treatments. There’s also a full--service salon.