I don't have any kids but there are great things that kids in my home country Egypt do in summer (and in winter):
-Work as assitnaces for mechanics to support their families (mainly in the cities)
-Work as servants in the wealthy people homes, again to support their families (mainly kids from the countryside)
-Playing football in the street (in order to be famous football players someday and support their families in the future)
-Studying (because they failed in previous year exams)