You could go to the Fort Wilderness Campground. They have pony rides for $5, a playground, you can eat at Crockett's. In the evening, they have Chip & Dale Campfire sing along, followed by a Disney movie at the outdoor movie theater...all for free. They have a hay ride in the evening, Mickey's backyard Barbeque. Hoopdy Doo Review, rent one of many different size boats at the Settlement marina. Play on the beach. At about 9 p.m. the elctric boat parade is on Bay Lake at Fort Wilderness Campground. After that, you can see and hear Wishes fireworks from the beachfront at the campground.
All these things will be great fun to you and your little ones.