Twister is always fun. They would have a blast! Also, you could get like little "surprises/prizes" (example: candy) and maybe have a contest of some sort. Kids love winning prizes. Scavenger Hunts are fun for kids! Again, have a prize. Make sure to have
crayons and paper available. Just in case they wanna color or something. That's all I can think of right now. Have fun and ...