I recently was on a private safari with some very good clients who have been traveling with me since 2007. They were looking for a bit of an adventure as well as some excellent photography. So I took them to Mana Pools.
Why Mana? Well, the uniqueness of the land and caused by a few factors means that the animals there are used to humans. Add in the fact that you can walk up to the animals (at your own risk) and you have all sorts of adventure lined up.