Save on walking by taking boats, trains and other modes of transportation inside the theme parks, such as the boats that cross lagoons at Epcot and Islands of Adventure and the train that circles the Magic Kingdom. Otherwise, your little ones are in for a big hike. And you will be in for a heavy load to carry. Another option is to bring a cooler and keep it in your car. Be sure to have your hand stamped for re-entry before heading out to the parking lot for lunch.
Most people travel in the opposite direction.
At Epcot, start your journey toward the right side of World Showcase, beginning with Canada. You will experience shorter lines since most people begin to the left at Mexico. At SeaWorld, wait to visit Wild Arctic until the Shamu show begins. Don't try to head there when people are leaving Shamu's Stadium - or you'll be in for a long wait. Also, if you want to skip the preshow at the manatee attraction and just look at the manatees in the underwater viewing area, enter through the exit.