I really like the idea of taking volunteerism one step further by going beyond "just picking up trash." I started a community organization that included the beautification of the main street with succulents and drought resistant plants. Now we have a core group of people helping to maintain the landscaping. Trash is now less of a problem. because the beautiful landscaping (done with the help of students from a nearby high school) encourages less people to litter and others to have a trash bag with them to pick up any trash while taking a walk.