Before you Travel
Read up on local cultures and learn a few words of the local language - traveling with respect earns you respect. Remove all excess packaging from your luggage - waste disposal is difficult in remote places and developing countries.
Buy Local Produce
Buy local, rather than imported and do not buy products made from endangered species, hard woods or ancient artifacts.
Respect local cultures, traditions and holy places - if in doubt, ask for advice.
Use water sparingly
Water is very precious in many countries and tourists tend to use far more than local people.
Take part in a local carnival!
Why not participate in a local activity like a carnival or fete? This way you really get the chance to understand local cultures and traditions.