Binoculars are a great edition to your safari bag. I recommend the light and sharp Nikon Monarch 10×42 ATB
I have had great success using the Better Beamer Flash Extender while on my photo tour in Africa. It allows me to light distant subjects and get images after the sun has past optimum lighting conditions. It is cheap and easy to take with.
When packing for your safari, choose neutral colors, choose modern fabrics that will dry quickly and keep you dry, and items with lots of pockets. Bring clothes that will function in layers so you are ready for changing temperatures.
Photo safaris are geared toward wildlife lovers and photographers of all abilities wanting to add many great photo to their collection. Most of your time will be spent out in the field and you will have long days that start early. Relaxation time, luxury, and a slow pace are not a priority.