(I don't know what the current policies are but you used to be able to apply in advance for VIP tickets, or buy them on the secondary market, which gives you much closer viewing of the launch)
We unanimously agreed KSC was by far the best of all. If you only do one thing in Florida, that would be it.
If you've never seen a gator then looking in the ditches by the road during the bus tour is a good bed.