Volunteering Your Way Across the World
- How to Ethically Volunteer Anywhere in the World by Shannon O'Donnell
Shannon covers everything: from choosing the type of volunteering you want to do, to the top volunteering organizations out there, to the questions you should ask your volunteer organization. She's also written a book on the subject.
If you're not an entrepreneur or just not ready to work for yourself, working for other people in exchange for room and board can be a great way to explore the world.
See also 2016 Best Volunteer Abroad Programs, Organizations, and Projects by Sarah Vandenberg.