You've probably heard of Airbnb. It's a website where people offer out short-term accommodation within their own home, or a home they own, to people looking for a place to stay for a night or a few days. If you rarely vacation yourself, or just don't like the idea of people staying in your house, you probably think you'll never have a reason to use it. You might be wrong.
If you have land outside or behind your house, or you're lucky enough to have a field, you could make money through the website (or even websites like it) by letting it out for camping purposes. If there's a festival nearby, or your garden faces an area of natural beauty, you might be surprised how desirable your garden is in terms of providing someone with a safe space to stay for the night.