A heady cloud of eucalyptus-scented mist is the warm greeting from the celebrated steam room of this Turkish-style spa. Done up in slate tile, the 500-square-foot coed hammam is the showpiece: spend $30 for up to two hours in the luxurious steam, or make it an add-on to other posh services. Mani and pedi stations face LCD TVs; two low-lit couples’ suites allow for side-by-side massages (12 types, from $60) and splashing around in the Jacuzzi; a facial (from $60) with Dermalogica or Swiss Line products will bring out your inner radiance. The hammam is free when you spend $100 at the spa or, if you want to get your steam on more frequently, sign up for the $8,900 annual membership.