The Collaborative International Dictionary of English v.0.48:

Bon vivant \Bon` vi`vant"\ (b[^o]N` v[-e]`v[aum]N"); pl. Bons
   vivants (-v[aum]N"z). [F. bon good + vivant, p. pr. of vivre
   to live.]
   A good fellow; a jovial companion; a free liver.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bon vivant
    n 1: a person devoted to refined sensuous enjoyment (especially
         good food and drink) [syn: epicure, gourmet,
         gastronome, bon vivant, epicurean, foodie]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "bon vivant":
   Brillat-Savarin, Cyrenaic, Heliogabalus, Lucullus, Sardanapalus,
   amateur, arbiter, arbiter elegantiarum, arbiter of taste,
   authority, board-and-roomer, boarder, boon companion, cannibal,
   carnivore, carpet knight, clubman, clubwoman, cognoscente,
   collector, connaisseur, connoisseur, connoisseur of food, consumer,
   critic, dilettante, diner, diner-out, eater, eater-out, epicure,
   epicurean, excellent companion, expert, feeder, flesh-eater,
   fruitarian, gastronome, glutton, good company, good fellow,
   good judge, good mixer, gourmand, gourmet, grain-eater,
   graminivore, granivore, hearty, hedonist, herbivore, high liver,
   hungry mouth, joiner, jolly fellow, judge, lactovegetarian,
   luncher, man-about-town, man-eater, maven, meat-eater, mixer,
   mouth, nightclub habitue, omnivore, omophagist, pantophagist,
   phytophage, picnicker, plant-eater, playboy, pleasant company,
   pleasure-seeker, pot companion, predacean, refined palate,
   sensualist, sensuist, social lion, swine, sybarite, trencherman,
   vegetarian, virtuoso, voluptuary