Hi Jacksmom!
To me, the "perfect" day would not be full of activities, but would be a chance to slow down in the parks, take in things we normally rush by, and not feel compelled to "hurry." One of my best memories last trip was hanging out by the railroad station in MK and watching a one-legged duck hop around looking for scraps to eat. He was so cool! Then we ran into the Mayor and took pictures with him and pet the horses that were lined up with the carriages. Times like that can't be planned, but they are precious!
Good luck with your planning!!