The Kennedy Space Center is amazing. If you're going and fine with spending some extra money definitely do a tour. The visitor center is cool and all but if you do a tour you can out to a launch pad or go see an actual Saturn V rocket and all kinds of cool stuff.
If want to go to the beaches over at Cocoa I'd recommend a snow cone place called Oasis. Its right by the Cocoa Beach Pier and the family that runs it is super nice. Also just really good snow cones.
If you have a free night Sac Comedy Club in downtown Orlando is outstanding and genuinely one of the funniest places I've been.
As everyone else has mentioned all the parks are all pretty good and you can't really go wrong with any of them.