OK the packing begins
Here are some thoughts and ideas
-Pack all light colored clothing (the sun reflects off light and absorbs in darks)
-Pack at least 2 outfits per day (this way you can have fresh clothes for the evening, no funky B.O. smells)
-SUNSCREEN make sure it is water/sweat proof
MAKE SURE YOU SCREEN YOUR EARS AND FEET
-Bring comfortable walking shoes and more than one pair, there is a good chance of rain every day
-Rain gear, you can buy ponchos @ WDW but for the same $ can can get much better ones @ walmart in the camping section. The ones @ WDW are short and will get your shorts wet where the ones @ walmart go down to your ankles.
-Fluids, we bring bottled water in to the parks
Now you can also try this (we are going to try it this year) you can pack lite and do some laundry.
I have never stayed at ASMo but the laundry is usually by the pool. With your kids being on the young side, I would recommend a trip back to the hotel for an afternoon nap and dip in the pool. Then head out for the even activities.
Have fun