WordNet (r) 3.0 (2006):

man-about-town
    n 1: a man devoted to the pursuit of pleasure [syn: playboy,
         man-about-town, Corinthian]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "man-about-town":
   Beau Brummel, arbiter of fashion, beau, blade, blood, bon vivant,
   boulevardier, city slicker, clotheshorse, clubman, clubwoman,
   cosmopolitan, cosmopolite, coxcomb, dandy, deb, debutante, dude,
   excellent companion, exquisite, fashion plate, fashionable,
   fine gentleman, fop, fribble, gallant, good company, good mixer,
   jack-a-dandy, jackanapes, joiner, lady-killer, macaroni,
   man of experience, masher, mixer, mondain, mondaine,
   nightclub habitue, playboy, pleasant company, puppy, slicker,
   social lion, socialite, sophisticate, spark, sport, subdeb,
   subdebutante, swell, swinger, taste-maker, tone-setter,
   trend-setter