Sea World is great for kids of all ages (even us big kids)- many of the activities and shows I'm sure the kids will enjoy; the Budweiser Clydesdales are there too, in a big stable, and often they go through the park several times a day. The kids always get a big kick out of that. Universal is more for the bigger kids, but fun also. Another idea is the smaller attraction Gatorland, prob 1/2 day activity, relatively inexpensive, and certainly do-able for those with younger children. It is on Orange Blossom Trail, just south of the Greeneway (Route 417).