Take full advantage of your natural resources. Have a tree with a sturdy branch? Hitch a rope to it and let your little athletes swing over a makeshift "moat," complete with blue beach blanket and stuffed crocodiles. Short brushes become hurdles, parch steps platforms to pole vault onto, and fountains obstacles to dodge. Use empty boxes (to stack and crawl through) and spare lumber (to create a balance beam). Finally, set up stations throughout the course where the kids must perform an activity, such as jumping rope 10 times or throwing a football througha hanging hula-hoop.