The Oasis Day Spa, a personal favorite of the Committee, has 3 convenient locations, including one for travellers going in and out of JFK. The ambiance is soothing, the staff is especially accommodating, and the "relaxation/waiting" room is chocked full-of-nuts (and other fun snacks), literally. It's hard to find a great spa in Manhattan that isn't overly pretentious and has reasonable prices. The only thing that makes the Oasis Day Spa any better, is SpaWeek, where massages and other select services are offered for $50. For more info go to: http://www.oasisdayspanyc.com/.