I really think the first week in May is much more enjoyable crowds wise.........March will be busy not only for spring breakers but Easter falls at the end of the month this year. Also with May you will be able to enjoy the Flower and Garden Festival at EPCOT which is always beautiful.............one other note, for the poster that was talking about the first week in June, not only is it much warmer and humid then the first week is usually gay days with Sat. being very crowded at the MK. I know May will probably be busier than normal because of the anniversary but still many people do not pull their kids out of school since it is so close to the end. If I were to chose I would defineately choose early May over March, with June a second choice.