Remove garlic mustard, a common woodland weed, with or without the supervision of a park ranger.
Pulling garlic mustard is a good volunteer activity for youth because the weed is not sharp or otherwise hazardous to handle. It is easily removed in Minnesota and surrounding states during the months of April and May, before it sets seed. This edible herb can be used in salads and on pasta, such as in the accompanying recipe, Spaghetti & Weeds. (Just be sure you get a clean patch of weeds with no herbicides or road runoff.)