Suggestions - since you have kids under 16 but older than 6...
Behind the Seeds: Take a walking tour of the "Living with the Land" attractions. Explore various areas within the greenhouse and techniques used for raising crops. $12 per adult - buy tickets at the Land - very informative
Call tours ahead of time to reserve a spot for the following:
407-939-8687
Disneys Behind the Magic of Our Steam Trains: Get an insiders look at one of Walt Disney's greatest passions, steam trains. You'll join the opening crew as they prepare the Magic Kingdom's steam trains for their daily operation. Youll visit the backstage roundhouse where these treasured transports are maintained and stored. All aboard for a ride on the Lilly Belle, Roy O. Disney, Walter E. Disney or Roger E. Broggie. $40 - ages 10 and up - but I think can take a bit younger kids
Epcot Seas Aqua Tour: Time to slip on your swimsuit and slip into the waters of the Living Seas. Your tour begins with a fascinating behind the scenes look at the aquarium. The grand finale is a half hour spent in the water with the inhabitants of this amazing facility. Your tour includes a group photo, refreshments, all of your gear and a T-shirt. PLEASE NOTE: Bathing suits are required. Wetsuits are provided and must be worn. Lockers are provided. Scuba certification is not needed. The water temperature will be in the mid-70s. No cameras/videotaping allowed. Other members of your party may be able to photograph you from inside the exhibit. (Park Admission will be required.) Jewelry is not permitted and expectant mothers cannot participate
ages 8 and up - pricey $100 per person
Mickey's Magical Milestones: The focus is on Mickey Mouse as you tour the Magic Kingdom. While visiting the attractions and locations that highlight his career, you'll delve into the enchanting world of everyone's favorite mouse. This tour features the development and achievements of this world famous icon. $25 - says ages 10 and up , but I think can accept younger well behaved children.