Personal:Hand Sanitiser, Small bottle of disinfectant, Wet wipes, Basic Medication like Panadol, Diarrhoea, Malaria Kit, "Swiss knife" kind of tool, long lasting torch.
Professional: Portable GPS definitely. No matter what people say, in Africa you are responsible for your own survival. A good offline aviation GPS on your android/apple device. Get a decent mobile internet asap. A VFR Map - Crucial!
Before you fly checklist: Sunglasses, Sunscreen, Mosquito Spray, Coffee Flask.
Get as many 2 min meal kits as possible even though you are in a hotel.
The locals are a pretty different bunch, keep your interaction as minimal as possible. But most important enjoy your flying, you've got way more self-respect than the oke paying to fly(or crash) a brand new B738.
Last but not the least stock on movies and music as much as you can.
