I think this depends on what your definition of easy is. Because as long as you like what you're doing, then you won't see it as something tough to begin with.
Now if you're referring to easy, as in you'll never have to think much, then you may perhaps want to try answering surveys. There are a lot of international market surveys available, and even in your own country. You just have to Google your way to these sites. However, it might take awhile before you earn a lot and request for payout.
If you perhaps have passion for arts then you may consider giving online classes say for music or art.
Moreover, you can also try joining other forums. That would be rather easy if you'll only answer the questions, which you think you can relate with.