For anyone who has been there more than a couple years back, it's worth checking it out again. They added Gateway: The Deep Space Launch Complex, and have also been expanding the Astronaut Training Experience. The exhibits are all very well done.

The bus tours are also neat, visiting and walking around launch pads from the early days of space exploration, seeing the bunker near a launch pad with ~8" thick glass and the mechanical linkage over a couple hundred feet which let them monitor the weight of the added fuel on an early mission.

I've gone 7 times since I was a child, and love the new things I find.