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.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
You probably visit at least a few sites that are relevant to your business on a regular basis, so why not join the conversation? Commenting doesn’t necessarily provide an immediate boost to referral traffic right away, but making a name for yourself by providing insightful, thought-provoking comments on industry blogs and sites is a great way to get your name out there – which can subsequently result in driving more traffic to your own site. Just remember that, as with guest posting, quality and relevance are key – you should be engaging with other people in your niche, not dropping spam links on unrelated websites.
Using a food delivery service can’t necessarily earn you money, but it can help you save you money if you constantly find yourself throwing out half the food you buy. Food delivery services send a box of food every week with new, sometimes unique vegetables, meat, fruit, and so on. If you don’t have time to shop and want simple meal-prep that leads to a good meal, a food subscription service may be perfect for you.
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