Just a little word about the coins because I've seen that get all kinds of stupid. Yes there is a tradition attached to it that involves drinking and it can be fun for those that want to have that fun. The rules are if you challenge people and someone that HAS A COIN, doesn't have it on them, they have to buy a round. But if you challenge and everyone has one, you have to buy a round. My addition is that if you don't want to play, you don't have to. If there is a challenge, just sit there. Don't go for a coin to see if you have one. As soon as you start looking for a coin, you're opting in to the game.
I don't want anyone to ever feel like they have to do this. And buying a round of drinks could be a round of Coke if you choose to play. It's just a fun thing so don't let yourself get to wrapped up in it.