4. Regular ol' card games
Before we judged people based on things like their Instagram feeds, there used to be a saying that you could tell a lot about someone by what they could do with an hour of time and a deck of cards. The bar is probably the best place to test that theory today, given the number of possibilities in a deck.
Most of the games people bring up in bars trend toward Kings, Asshole, Bullshit, and all those games with curse-word names you learned in college, but there's also nothing wrong with busting out an old-fashioned game of Spit, bridge, spades, gin, or euchre (if you have time to teach people how to play). Of course, you have to either travel with your own deck (which isn’t too crazy to suggest) or find a bar with decks that aren't missing cards, mashed together in a giant pile, or soaked in spilled beer. So… yeah, maybe just roll with your own.