There's been a big storm and the playschool yard is littered with branches and other debris. The children all pitch in to help clean up the playground . When Caillou and his friends, Leo and Clementine, finish their cleanup duties they decide to build a road through the sandlot. Using simple tools and their imaginations they lay out a road, build a bridge, dig a tunnel, and even plant a tree fashioned from a leafy twig.