Like pet sitting and baby sitting, most people who search for this type of work are teenagers looking for a few bucks. However, this can be a lucrative opportunity for adults with some spare time on their hands. Mowing lawns, weed-whacking, watering, and other yard chores can be a challenge for some people. Your targets are the elderly, the lazy, and people who lead busy lives. When I was younger, I lived with a guy who mowed two lawns a day for several days a week. He lived almost exclusively on side-jobs.

In most cases, you can do a yard in an hour and most people will pay you between $15-$20 per lawn. If you can set yourself up with a lawn five days a week, you can make $400 or more every month. Some neighborhoods with rich people and larger lawns will pay a lot more too. As far as side-jobs go, this one is pretty great.