Don't sell yourself short on KSC. We were there from open to close and still missed both IMAX movies. It offers SO much. Be there when it opens and take the shuttle bus tour 1st - don't miss the show in the big building at the far end of the tour bus tour . . . it is spectacular. Then go back to the main area and do the Atlantis building - don't miss the movie/show there and they have a great memorial in there for the Challenger too and a great simulator ride. I think we would have enjoyed 2 days there, but it's just not convenient to hotels, etc. We find we can easily need 2 days for both the KSC and SeaWorld to see everything. We need even more time than that at Universal/IOA and each WDW park. We think everyone needs to see KSC- it has such great history and amazing things to see.