We can shoot some pool, throw some darts or play some video games. They have lots of options for activities and if all else fails, you can watch (or mock / cheer on) others. They have a pretty decent menu there if you want to grab a late dinner or just take care of a case of the munchies. Depending on how many people we have, we can decide if we want to just use coin-op tables or go for the hourly tables. Sometimes I can cut a deal with them if we have enough people signed up in advance.
Fair warning, depending on how late we stay and how I am feeling that day, it's not uncommon for me to swing into Arizona's on my way home for dancing. So if you are up for it, bring your dancing shoes just in case. :-)