Looks like a good trip for the experience and the cause.
I spent 6 months in Kenya and 3 months in Tanzania in '08-'09. Went on a couple safaris in both countries but it was in Tanzania where I really got to go out and see the locals. I worked with a guy who was in charge of cutting the checks for schools, hospitals being built/or refurbished and wells being dug, mostly by local contractors. It was a good experience for all the good and bad things I saw.