May as well treat it like a full vacation! Milk those four days for all they're worth!
Hmm, how good are you and how much do you like thinking? Blackjack is definitely the easiest and you barely have to think about that, unless you really wanna play. Poker's a classic... roulettes is always fun.
Mm... All we really have is pachinko [ which they all play entirely too much of and he's not about to cop to how much of their parents' money they blow on that ] so I don't have much experience with any of this, actually.
At home we mostly play mahjong, which... is a little like poker, I think? I like games that are more about strategy, anyway.