If/when you go, definitely take advantage of the bus tour that comes with the ticket price. It's a 2-3 hour tour that drives you to restricted areas you can't get to in your own vehicle. You get to see one of the launch pads, the crawlers used to move the rockets, and the Vehicle Assemble Building (VAB) which is super cool close up!!! Here are few of the pictures we took on the tour.
The bus also drives you by the Space X building here.
The bus drops you off at the Apollo/Saturn V center which is a museum of sorts dedicated to the Apollo missions. A super cool place!!!
Then you take the bus back to the main facility. At the main facility the biggest exhibit area is dedicated to the shuttle missions, specifically the Atlantis shuttle which is on display.
Wow! Wow! Wow! Wow! In addition, there are a ton of hands-on simulators for you to play around with. My kids loved this place and so did I. There's also the rocket garden outside, as well as a couple of gift shops that are very reasonably priced.
You can spend more money going on another bus tour that gets you closer to some of the restricted facilities, but if you've never been to KSC, the standard admission is more than enough to fill your day.
So the next time your at Disney or near central Florida, definitely clear a day to visit the KSC. You won't regret it! It is an amazing place!!!