Well I really enjoy chilling out with my pals in a bar/pub, drinking beers or whatever and talking about everything that may be talked about. I'm probably the more reserved the group, of course; but that's a given that we are not going there because it is a meat market or whatever; we sometimes drink a little too much, but even then it's still because we're here as friends and are having fun.
And I'll tell you, we more or less are all the average "nice-guy" type. We won't hesitate to talk to other people if we feel they can take part in the whole "having a good time" thing. And yeah, we're all singles (well, all but one).

That said, I agree with >>11, the kind of population that frequents a bar varies widely, some places are best known as "places to get laid" and whatever. But still you'll find people that just are there having fun for themselves. I suggest you to look for this kind of group and find a way to join in. This can end up at least to a good evening, and might go further. Who knows?