Iguazu Day Spa (CLOSED)

Although it’s helmed by Fabien Azoulay, a former manager at men-only spa Nickel, this small, pristine duplex caters to both sexes and offers everything from partyworthy blowouts (from $48) to pore-suctioning backcials ($118). All treatments (except for the nail services) use 100 percent natural ingredients—so you don’t have to worry about being exposed to harmful chemicals while you’re getting highlights (from $148).