You can see everything twice in a day if you're there from the second they open to the second they close. You'd have to work very fast though, and by that I mean sprint from attraction to attraction. Really, just try to get there early, and remember that when it's closing time, they don't chase you out with shotguns, so there's no real rush there. Also, if someone has some sort of handicap, you can get a front-of-the-line pass, or something like that. I think you can even get one just for having ADD, so try to get one of those to save time. Also don't dawdle, you're there to go have fun, not sit around.