What about face painting? Paint little noses and whiskers. You could make little kitty ears with headbands. You may need to do puppy ears with string for the boys. You could get a big bucket of water and do bobbing for "fish"! A scavenger hunt to find the paws with clues on them. At the end could be a "kitty treat" for everyone. An individual bag of goldfish could work as the treat. Or even a who can find the most paws. Musical chairs only they would sit on a Kitty Pillow or something kitty related instead of a chair. Hope those help!