What is the best way to make a difference or make an impact?

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I'm curious. I've often thought about joining an organization like the Peace Corps but for whatever reason, life has taken me into different directions. I have a friend who joined and taught English in Japan. She said it was one of the best things that ever happened to her. Lately I've been feeling the need to do something. I have an urge to go to one of the African nations and work with AIDS sufferers or help put in an irrigation ditch or something. My quest is to do something that will have the most impact on the most people. I've done things like volunteer at soup kitchens in NYC, given money/food/clothing to people on the street. What are some suggestions? What kind of action would impact the most people?