Well I guess I'm in the minority, but a four year old is really going to want to spend a majority of time in fantasyland & riding those rides so if you get to MK right at rope drop you could probably get most of those rides in by the first hour & then take it leisurely the rest of the day seeing characters, parades, etc. We took DD for the first time when she was 2 1/2 & she kept wanting to ride small world over & over again, which we gladly did since it was all about her anyway. We actually managed to do quite a bit that day as far as rides, the parade, etc. Did we see everything? Nope, but we knew we wouldn't anyway. Of course we've been back many many times since so it didn't really matter. I definitely agree with a PP & get a stroller. It will be a life-saver no matter what you decide.