It's about an hour and a bit on the bumpy side. I think I may have had the world's largest Big Gulp and the world's dumbest idea by hopping on this bad boy shortly thereafter. Regardless, it's fun, peaceful and keeps your interest, granted it has it's cheesy moments. I would recommend doing the tour FIRST (or rather SECOND after the trip to the restroom.) It's at the other end of the park and down about three or four very large escalators. You'll be better off starting there and working your way back so you can get everything in.
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