Well, the question is "How many people have their own baseball mitts?" We only need enough to support half the players, after all. We have a few hanging around here (we needed at least 3 since my 2 sisters and myself were playing Base/softball all at the same time), but defnitely not enough. If you have any, bringing it couldn't hurt, as would putting your name somewhere on the mitt!
Honestly, not seeing how Dodge Ball would work so well, unless I'm thinking of the wrong kind of Dodge Ball (we're talking about the one that's like the movie, right <_<?)
Soccer is a potential one too...I think we even haev a soccer ball here!
And...Zenny, there's a Bottleking near the Hotel, would that work?
Oh, and Djinn, for the Karaoke thing...we haev Guitar Hero World Tour; there will be plenty of people making fools of themselves, to the point where the game mocks them for doing a horrible job! Alcohol is not required for that <.<
(I should probably talk myself into playing the game and trying unlock more songs though...)