This 23,000-square-foot world-class spa boasts 16 treatment rooms and a range of services, from facials to body treatments to massages. Amenities include private men's and women's locker areas with steam rooms, saunas and Jacuzzis. A 5,500-square-foot fitness center is also available, featuring spectacular views of the resort's swimming pool. For a truly calming experience, be sure to try the Balancing Elixir Journey, which uses warm desert stones aligned with acupuncture points along the spine as well as an enzyme cream and elixir wrap to bring balance to the seven chakras. The service also includes a Shirodhara treatment to awaken the third eye and an application of hydrating body butter from Kimberly Parry Organics.

Voted best spa in the Las Vegas area by the Las Vegas Review-Journal several years running, the 30,000-square foot Spa at Green Valley Ranch is the very definition of tranquil, surrounded by a private swimming pool, private poolside cabanas, manicured lawns and vineyards. Featuring 22 treatment rooms, including VIP pampering suites, the menu of services includes such unique specialty treatments as a Green Tea Wrap and Ashiatsu Massage, while the facilities include a co-ed steam room, Jacuzzi and private outdoor area with a 25-meter lap pool and outdoor accessible steam room. For a truly sweet service, the Orange Oasis body treatment is sure to leave skin soft, smooth and smelling great, as it includes an orange herbal cleansing scrub to eliminate dry and damaged skin and an orange blossom moisturizer. It's the perfect summer service!

Costa del Sur Spa & Salon inside the South Point is always worth the trip for those looking to enjoy a little rest and rejuvenation. With 28 treatments rooms, an extensive menu of services--including custom-designed men's treatments--and a private couples-only retreat area with its own sauna, steam room and Jacuzzi, it's one of the most luxurious spas in town. It also offers private men's and women's wet areas complete with their own Jacuzzi, steam room, sauna, cold plunge pool and waterfall showers. For a truly relaxing service, be sure to try the Four Handed Massage where two massage therapists simultaneously massage away all of your stress.

The first spa in Las Vegas to receive Forbes' prestigious Five Star rating, The Spa at Wynn is home to 45 treatment rooms, a lavishly equipped fitness center and separate men's and women's locker areas complete with their own steam room, sauna, whirlpool, deluge showers and plunge pools--one cool and one warm. The men's quarters boast a sophisticated combination of dark wood and marble while the women's quarters are embraced in warm, neutral tones. Services range from massage therapies and body treatments to facials and airbrush tans. For a truly amazing experience, be sure to try the spa's signature Good Luck Ritual: a revitalizing treatment that combines a fusion massage, invigorating peppermint foot treatment, ultra-moisturizing hand therapy and relaxing, botanical scalp massage, resulting in 80 (or 100) minutes of pure bliss.

Spread over two floors and featuring 17 treatment rooms--including seven private couple's suites--this Forbes Five Star spa reflects the luxury of 1930s Shanghai. Guests can soak up the Strip views--a rarity at any Vegas spa--thanks to floor-to-ceiling windows in both the private men's and women's locker areas, which also have steam rooms, laconiums, vitality pools, heated chaise lounges and experience showers. Other amenities include a ladies' rhassoul, a men's sauna and a hammam. For a truly remarkable service, be sure to try the Mahjong Balance. Inspired by the traditional Chinese game Mahjong, the treatment includes a welcoming foot ritual using ginger, jasmine and green tea to stimulate and uplift, a skin smoothing body exfoliation, a deep therapeutic massage using warm jade stones and an oriental head massage, giving guests a rejuvenated sense of equilibrium.

This 80,000-square-foot, two-level spa and salon offers guests a peaceful haven where nature's healing properties take center stage. Salt, stone, earth, fire and water join to create a spa experience that elevates guests to a meditative state for introspection and relaxation. Boasting 62 treatment rooms, including four Ashiatsu rooms and two vichy rooms, amenities include the country's first Japanese Ganbanyoku Stone Beds and Las Vegas' first co-ed balcony with an infinity-edge pool that overlooks ARIA's stunning poolscape. There's also a co-ed Shio Salt Room and private men's and women's saunas, steam rooms and whirlpools of varying size and temperature. Soothing services include the Thai Poultice Massage, a muscle-relieving massage based on centuries-old Thai healing practices that soothes away tension with steamed poultices infused with lemongrass, ginger and prai extract.

One of the largest day spas in the world, Canyon Ranch SpaClub at The Venetian/The Palazzo offers an oasis of serenity on the Las Vegas Strip. Guests can spend the day unwinding in its lavish Aquavana, a European-inspired aquathermal oasis offering intriguing treatment suites designed to relax your muscles, enrich your blood with oxygen and rid your body of toxins. Single-sex thermal environments include a crystal steam room, Finnish sauna, herbal laconium, HydroSpa, experiential rain showers and igloo room; co-ed environments include a salt grotto, conservatory and wave room. The menu of services, meanwhile, features a variety of unique treatments in addition to the usual massage, body treatment and facial offerings, including ritual baths, Ayurvedic treatments and energy therapy treatments. Seasonal specials are often available as well. For those experiencing foot pain, be sure to check out Canyon Ranch SpaClub's Healthy Feet services--they're sure to put a little pep back in your step.

This Forbes Five Star is one of the Strip's most breathtaking retreats. At 61,000 square feet, The Spa at Encore features 37 treatment rooms, a gym with two fitness movement studios and separate men's and women's facilities each with their own steam room, sauna, hot and cold plunges, heated stone chaise lounge chairs, experience showers and waterfall showers. The men's and women's facilities also boast two large whirlpools with individual concaves for guests to sit in that provide spa-goers with their own jets and even armrests. Talk about unwinding in comfort! For those suffering from some deep-rooted tension, be sure to try Encore's Thai Oil Fusion Massage. One of the spa's deepest, most therapeutic massages, the treatment blends Thai stretching with a Thai-influenced oil massage to deliver deeply relaxing yet energizing results. You'll truly leave the treatment room feeling more limber than ever!

Inspired by ancient Roman traditions of relaxation, this tranquil, 50,000-square-foot oasis taps into the natural healing powers of water while incorporating historic rituals of "social spa-ing." Amenities include QUA's signature Roman Baths--three pools of distinct temperatures with mineral-enriched waters to help restore natural elements of the skin, improve circulation, remove toxins and reenergize the body--an Arctic Ice Room, co-ed laconium, steam room, sauna, whirlpool and Tea Room. In addition to being the only spa in the world to offer official Nobu brand treatments, QUA's extensive menu of services features everything from traditional massage to hypnotherapy to an Ayurvedic series which includes signature chakra balancing and Shirodhara treatments. Be sure to try the spa's signature Hourglass Treatment, where QUA's talented spa Artisans create a personalized experience combining facials, body treatments, hot stones, aromatherapy, chakra balancing and energy work to meet each guest's individual needs.

One of Las Vegas' most luxurious spas, the recently renamed Spa Aquae at JW Marriott Las Vegas features 36 treatment rooms and an extensive menu of environmentally-friendly services, including massages, facials, body treatments, wraps and scrubs. Guests can unwind in the private men's and women's Ritual Rooms before or after a service, which offer such soothing amenities as a warm float pool, hot and cold plunges, cascading waterfall showers, saunas and steam rooms. There's also a co-ed area outside boasting its own sauna, steam room and whirlpool as well as a Hydro-circuit pool. A fitness center and yoga studio round out the spa's luxurious offerings. For a truly heavenly service, be sure to book the hydrating Cabernet Crush body treatment, which includes a crushed red grape and orange blossom exfoliation followed by a warm wine and honey body wrap and a wine body oil massage.