The Collaborative International Dictionary of English v.0.48:

Escapade \Es`ca*pade"\, n. [F., fr. Sp. escapada escape, fr.
   escapar to escape; or F., fr. It. scappata escape, escapade,
   fr. scappare to escape. see Escape.]
   1. The fling of a horse, or ordinary kicking back of his
      heels; a gambol.
      [1913 Webster]

   2. Act by which one breaks loose from the rules of propriety
      or good sense; a freak; a prank. --Carlyle.
      [1913 Webster]

WordNet (r) 3.0 (2006):

escapade
    n 1: a wild and exciting undertaking (not necessarily lawful)
         [syn: adventure, escapade, risky venture, dangerous
         undertaking]
    2: any carefree episode [syn: escapade, lark]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "escapade":
   antic, bat, bender, binge, bout, bust, caper, carousal, carouse,
   celebration, debauch, drinking bout, fling, frolic, lark, mischief,
   orgy, ploy, prank, randan, randy, revel, roguery, rollick, spree,
   tear, toot, vagary, wingding