Visit the parks when they open their gates, they don't get really busy until early afternoon at that point leave (don't forget to get your hand stamped), get lunch and let the boys sleep for an hour or two. Hopefully they'll be fresh to go back later on.
in WDW do not watch fireworks or the electrical parade (wonderful) anywhere except near the exit otherwise you'll be trapped in a bottle neck stampede of people trying to get out. It is hell getting out, the kids are tired and the monorail is heaving. Make sure you are in Main St square right by the exit.
Buy souvenirs on the way out.
If you get time visit Gatorland, Cypress Gardens is good too and not too busy (about 40 mins south of Orlando new park) and there is a new waterpark there too.
If you decide to rent a house go to Windsor Hills, Windsor Palms, Formosa Gardens,Rolling Hills or anyone local to them they are the nearest resorts to Disney. Many housing estates/resorts say they are only a few minutes away but they aren't.
Outlet shopping at Premium Outlets is great, lots of bargain designer labels.