We're planning a one day trip to Disney during our vacation. My fiance believes we can do all 4 parks in one day without any stress. Personally I think he's crazy, but has anyone out there done it before and actually enjoyed it? He's from Florida, so he's been there many times along with his daughters (all grown). I've been there twice for 11 days each time and still felt like I hadn't done it all. Any ideas?