Schiff bar in the old town is okay for a few drinks, it's just off from the cobbled square, up the stairs (though they have a ground level section too). It's small though.
About 11pm try Widder Bar which is also in the old town, just at the top of the cobbled square next to the Widder restarant, through the wooden door and up the stairs. It's also small though.
Mantra across the road from Mr Pickwick's does the cocktail's thing, its not too bad I guess.
Or if you REALLY want to feel out of place try Juanita's down on the lake front. The regulars there all seem to know a syncronised dance routine (not unlike billy ray cyrus style line dancin') and all take to the small dance floor when a certain song is played. Felt very out of place! Won't go back till I've learnt 'the dance'.