One of the hopeful developments in Africa has been the growth of private sector conservation initiatives. Most of it has taken place in South Africa. For an example in Tanzania, visit the Ndarakwai Ranch.
The ranch is located on the slopes of Mount Kilimanjaro. The owners set up the Kilimanjaro Conservancy to maintain a wildlife conservation area.
Somehow elephants seem much larger when you are walking close to them, than when you are sitting watching them from a 4-weel drive vehicle. Ndarakwai is well worth a visit.