M.A.
Mhy family went to Fl. a couple of years ago when my kids were similar in age as yours. This was by far one of our favorite trips. When we booked our trip to Seaworld we included the vip behind the scenes package. Besides getting on rides first you also get to feed peguins, eat lunch by Shamu, and have a guided trip through the park. SeaWorld also has a great Luai that compares to the one in DisneyWorld.
I think your kids would also like Universal Studios two parks.
Disney is a little more for younger kids. I hope this helps you out. M. A.