for all of the six days that you plan on spending down there such as figuring out what particular days you want to visit each park. If you don't have a WDW guide book it is helpful to get one and read about all of the rides, shows, and attractions that are located in each individual park that would interest your family.
By the ages of your children, it seems like that they all would definitely enjoy the Magic Kingdom alot. There are certainly more rides there for both older/younger kids alike such as favorites like Small World, Winnie the Pooh, Pirates of the Carribean, and Snow White for everyone but Space Mountain and Big Thunder Mountain Railroad for older ones to name a few.
Once you leave M.K. your younger child will probably enjoy such things as the Muppet 3-D show and Honey I Shrunk the Kids Playground which can be crowded at certain times of the day at MGM and the Living Seas inside Epcot along with a great deal of Animal Kingdom.
Also, if you stop over in Mickey's ToonTown Fair inside the Magic Kingdom, the kids can tour Mickey and Minnie Mouse's house. Also, you can stand in a meet/greet line where they can have photos made with Mickey in person. If they would like autographs of the various Disney characters (they usually stroll around at different times) they can bring along autograph books and collect their signatures.
Since you are going in August, it will without a doubt be very hot and humid during your visit (I've been down in August a couple of times). I would definitely bring along items such as sunscreen, sunglasses, hats, face cloths, and water bottles to use while walking around. You can place these items in a backpack or other bag because when you are touring the parks they will be a lifesaver. Additionally, you can place small snacks inside for everyone to munch on.
Another thing that we found useful last year was bringing along the water mister fans that are found in Wal-Mart or similar stores; they were great in attacking some of the heat. Also, I would plan a day or some significant time to just take a couple of swims in the pool to cool off. If you have the opportunity, you can schedule in a water park as well.
I hope you enjoy your trip!
[This message was edited by deena on 04-25-01 at 11:43 PM.]