Neil Armstrong's first act after stepping on the Moon was to open a
pocket in his pants and fill it with a "contingency sample" of lunar
soil. That way, if he and Buzz had to leave immediately, at least he'd
have something to show for the trip.

Your "contingency sample" at KSC should be the Rocket Garden and the
Saturn V Center. Work everything else around those two destinations.
Make sure you get to stand under the business end of the Saturn V's
first stage. That's worth the whole trip.