Rake yards in autumn if you live where leaves fall. Grab a rake and a few large trash bags and go from house to house offering your services. Ask your neighbors what areas of their lawn they want raked and where you should put the leaves, like on the curb for collection or dumped in a wooded area behind their house. Rake leaves into a large pile, then stuff them into a trash bag and tie it closed.
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Wash cars or bikes if you have a big enough driveway. Gather some sponges or old rags, towels, car washing liquid, a big bucket, and a hose and set up a washing station in your driveway for a few hours on the weekend. Scrub each vehicle, focusing on any dirty spots, rinse it thoroughly, and buff it dry with a microfiber towel. Charge $10 to $20 per vehicle.