One thing a friend of mine mentioned to me is tutoring english lessons to kids in other countries over the internet. Parents in some countries such as china are very keen to teach their kids english, and particularly like being taught by a native english speaker. I haven't tried this myself but it has the advantage of not requiring any physical work, although it might mean working nights if you're teaching people in different timezones. I haven't investgiated it myself, so I don't know much about it, but it might be something you could look into. I have no idea what the earning potential is. Possibly you might need some kind of teaching qualification. Anyway, just a suggestion.