Is it possible to do US/IOA in one day? I am thinking of doing a 1 day park-to-park ticket on Nov. 18. The crowd prediction calendar shows it as being a light day for both parks. I would be staying off-site and won't have express passes. I am debating on whether or not to buy 1 or 2 day tickets. Thanks a lot for any advice. If I need 2 day park tickets, I would go on 11/17 and then come back on 11/20. We are spending 4 other days at WDW.