Just to add my experience to this thread. I have been to Africa twice in the past two years - Botswana in the Okavanga Delta, and Kenya in the Masai Mara, Lake Nakuru and Samburu Park. Both trips lasted about two weeks each. I never had occasion to use a tripod, in fact when we went to Kenya, the trip leader who had been there over 20 times, specifically mentioned that tripods were not really feasible with the "pop top" jeeps. I took a bean bag and that worked very well. I took it empty and had it filled at the first camp for free, then simply dumped it when the safari was over. Depending on the form of transportation you have, you will not be able to use a tripod and probably not even a monopod unless this is a photo safari, in which case you will probably have a whole row of seats to yourself and then it may be feasible to use a monopod. In Kenya, we did stop and visit a couple of Masai villages, but this was during the day so a tripod was not necessary.
If it is a "regular" safari, you will be sharing the jeep with others making the use of a tripod impossible, regardless, the layout of a safari jeep precludes the use of a tripod. As far as sunrise/sunset pictures, you will probably be in the jeep during both and they can be captured quite easily with a bean bag on the top of the jeep. If you are in a Park as compared to a private game preserve, you will not be allowed to step out of the jeep - park rules - and the guide will simply not allow it. When I go again, I might consider talking a Gorillapod, but that is the only thing. Do not count on being able to take sunrise/sunset pictures in camp as the odds are you will be up and out before sunrise as we were all the time on both trips, and we were always out until at least 30 minutes after sunset. You may not necessarily get good views of them from the camps anyway. If you do take a 'pod, you will probably find that it is excess weight and something that you will probably never use. This is my experience - HTH.
WesternGuy