We did the exact same thing with our daughter the first time she went to Disney, took walks around the neighborhood, a little longer every day, and I kept telling her there would be alot of walking at Disney. She was great for our whole trip. We got to Disney, met up with our friends, who had a son my daughters age (6) and his little sister 3. They both fought and whined for the stroller. My daughter thought they were nuts. If your child is too tired to walk, when they do not use a stroller at home, then it's time to head back to the hotel. I imagine the kids that conned the adults to 'carry them' were raring to go, to the pool, the ice cream stand, the whatever, once they got back to the hotel. My opinion, if your child is over 4, then they should be walking. Walking won't kill you, obesity will.