The most fun I ever had in a room full of funny people was playing what we call Dictionary. Here's the basic instructions:
Fictionary - Wikipedia.
It's really fun if you've got a lot of jokers and creative types. Kids in the mix makes it even more challenging - you'd be surprised at how crafty some of their definitions are. If you are looking for physical/active games it's not that though.
I hope your party is fun (sounds like it)!
Edit: Here's some more from the party games category on Wikipedia:
Party Games