It's important to remember that the tours Barry spoke of are "backstage" tours and not tours of the park itself.
There is a tour called "Adventure Express" that costs a whopping $55 ($50 for kids) in addition to regular park admission. This takes you around the park, with priority seating at the shows and front of the line privileges at the rides and also includes the backstage elements.
Space is limited and despite the price it fills up, so reserve by calling 407-363-2395