You can't just walk around whereever you want, as they have most of the areas roped off. When we ate at Crystal Palace before the park opened, we were then allowed to line up by the rope drop at Frontierland before the rest of the people were let in. (We went over at about 8:45.) We could not go into it, though, until the park was officially open. At DHS, we ate at Hollywood and Vine and were done by 8:35 or 8:40. We were able to sit on the bench just outside the restaurant, and they let us move up to the rope about 10 min. later, only slightly before the rest of the crowd. Not sure how Animal Kingdom would work, because we didn't really get done at Tusker House until just before 9.