A trip to a berry farm, an apple orchard, or a pumpkin patch teaches kids that produce doesn't come from the supermarket. Ripened blueberries and raspberries are edible right off the branch. Be careful picking blackberries, which often grow on thorny stems. If your child likes to eat apples off the tree, make sure they're organically grown. When you get home, make a pie, a cake, or jam to show how nature's bounty can be put to good use.