Rainy day ideas for my family:
Head to a water park - never seems to rain all day and when it does stop, you will have the slides and other things all to yourselves!
Take the opportunity to tour a resort you've always wanted to see.
Disney Quest
Outlet Shopping
If you stay in a hotel with exercise equipment, now might be the time to use it!
If rain is in the forecast, plan on Epcot, plenty of covered areas there.
Go to the movies
Search for hidden Mickeys and have a prize for whomever wins