2) When purchasing goods and services, be sure to mention that you're a volunteer. Many vendors will offer you an additional discount when you're negotiating a price.
3) If you're teaching English, come prepared with many lesson plans and educational games (for various ages). The schools are often lacking in structure and may look to you to create the lessons. Use different kinds of learning materials to make the lessons fun - music, maps, markers, poster-boards, etc. - most of these items can be purchased in
4) Don't load your suitcase or backpack down with books from home.