Take paper plates and cut two eye holes out - then take paint stirring sticks from Home Depot (usually free with paint) tape one to each plate - now you have a bask for a fave mask - give the kids (and big kids) - red bows, black circles for ears, etc so everyone can make a Minnie or Mickey mask - or any other Disney character they can think of (different color plates - diffenter characters - blue stitch, white donald, etc.
Also, for the adults - the Disney Scene it or Disney Trivia Pursuit are great - they usually have kids and adult questions.
for the kids also - Disney.com has printable coloring pages - so print those out with crayons/markers.
Lastly, check out disney's website - esp the Playhouse Disney section - they have lots of birthday ideas etc.
have a blast!