Sure, if you think of après-ski on Arlberg, you think of St. Anton. The town is known as one of the best party spots. Numerous rustic huts, umbrella bars, and snow bars turn the ski resort into one big party. At the valley, a bunch of pubs, bars, and clubs provide the space to party all night long – as long as you have the necessary wherewithal, as the drinks are far from cheap. Besides that, St. Anton has everything a true après-ski fan's heart desires.
A party with the well-heeled crowd in Lech costs a pretty penny as well. The parties aren't as loud as in St. Anton, but much more elegant. The most popular spots for post-slope champagne are 4*** hotel Tannbergerhof's bar as well as Krone Bar at the 5***** hotel Die Krone von Lech.
If you just want to grab a bite to eat and some drinks, Zürs, Warth, and Schröcken have the right establishments. You will find anything from fine dining to quaint pubs.