Use vinegar and baking soda to fill up balloons- so cool!
Via:
Hello! Started by a volunteer in the Big Brothers Big Sisters Program, this blog lists positive activities that are primarily low-cost or free and geared towards youth ages 6-18. Most activities are for individual youth (or a few friends) or can be implemented by adults guiding individual young people or small groups. The activities range from online educational activites, arts and crafts, to creative game ideas.