How does yahoo.com advertise?

Where should I advertise or find an agent to advertise a REAL ADVENTURE in Africa, involving development?

• I would like to advertise a tour, search for clients who are specialists in journalism, law, environmentally friendly tourism, business, education, poetry, crafts, music and much more to come into an area for about a month to learn about its problems and try to commit themselves to solving them. And the problems and challenges ARE NOT EASY, PROMISE: Malaria, HIV, climate change, deep poverty, no sweet water, semi-arid conditions, political suicide, environmental degradation but especially wood-cutting that helps to support and informal salt industry that could affect 100,000 people from Tanzania to Congo. The challenge is to define the problems and to cooperate and work together under the aegis of a tour licence. Sort of kibbutzic but not really. No big rules, except those set up by the culture (Islamic/ animist/ witchcrafty/ disadvantaged) I could post up more info on a website. I imagine this might attract sophisticated bored professionals in New York Review classifieds or?

• Answer:

  try idealist.org, a job/volunteer post site for adventurous do-gooder types.