Pick some fruit

Most towns have fruit trees that are under-utilized. Reduce waste by knocking on someone's door and asking if you can pick from their trees; they'll probably be relieved and grateful, especially if you give them some of your haul. If you collect more than you and your neighbors can eat, there must be schools, shelters or other organizations in your neighborhood that would be glad to have some free fruit.

Effort involved: well, slightly more than sitting on the couch and wondering what kind of sandwich to make, but climbing trees is fun. Scoring free food is also nice.