Do not give candy to children or money for pictures. In fact, nothing should be exchanged directly between tourists and villagers. A village is a very communal place, and what belongs to one belongs to all. Jealousy and hate between villagers can arise because one family or person received something from a tourist and another did not. Jealousy, believe it or not, is a major contributor to the drop in population in villages visited by tourists. The ones driven away are actually the lucky ones though, as they wind up in a neighboring village that is closed to tourists