This could help emergency vehicles find homes if the numbers are not obvious on the house or mailbox. If you get a few friends together, you can hold a community car wash. Wash the outsides of cars, and even clean the insides, too. Wash dogs for your neighbors, and even brush them afterwards. Just make sure you like animals because pet sitting can get a little dirty.
If you pet sit, you can charge by the day. Offer to walk dogs for your neighbors, or feed their cats or dogs when they go out of town. Charge different prices based on the size of the yard and the size of the job. You can mow them, rake leaves, clean up debris, and shovel snow. Think about things you are interested in, things you are good at, and what you can physically do.
There are many things people in your neighborhood would pay you to do.