Jim's advice is right on target. See the Apollo presentations. The Saturn V
Center is the best part of the three main tour stops, the other two being
the launch pad observation platform and the space station center. I think
the Rocket Garden is the last free exhibit, and much of it is real hardware.
If you decide to do just one premium package, I recommend the NASA Up Close
Tour: it gets you closest to the Saturn/Shuttle Pad 39 complex, and a number
of the working portions of the center.

I found the AHOF to be very enjoyable because of all the astronaut's
personal artifacts, but I'd save it for a return visit if KSC main is your
primary target.

Enjoy your trip.

JW

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