Concert square is horrid, full of young kids who can't handle their ale all ready to kick off. If I were you I would go round the Albert Dock bars, less chance of idiots there than Concert square. Depends what type of places you are after, I could list a great pub crawl of traditional pubs but if it is more bars you are looking for then Albert Dock or Newz Bar, Mosquito, Revolution on Matthew St, Ropewalks area- Alma De Cuba etc would get my vote as places to go. I really dislike concert square that much.
You might be able to get a game of pool in the 147 club on wood street or one of the sports bars.