Athi - A great multi day trip. Some fun continues rapids, some pool drop runs. Some big hard drops and a must portage. You will have to scout at least 4 times. The rest of the run is read and run class III/IV. It is a wilderness trip but there are a lot of local people around. They will help with the portages. Happy days.
There is a lot of flat water. So the higher the river the better.