If you have a family pass to your local children's museum, I think they recipocate at the Orlando science center and it is awesome, Your kids could easily spend 3-4 hours there. We did this 2 years ago. I think the general admission is about $9.00. Like I said, we had a pass from Omaha and it worked. I heard that the Kennedy S. Center does the same thing, but I haven't confirmed that myself, yet. Their admission is rather steep, about $25 per adult. Yiks... that used to be free~!!!!