But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.
Run virtual errands. If you have a computer with Internet connection and are good at searching the Web and communicating with others, you can become a virtual personal assistant with Fancy Hands. The service hires assistants, who set their own hours, to help its users tackle tasks such as making calls to service providers, scheduling appointments, and finding the best prices for services and products. You get paid per task, starting at between $3 and $7.