When you eventually get to your photographic safari destination and you are driving on a tar road and a touring bus is coming towards you, you know that there is something wrong. Your are not at the right place, this is not the safari feeling you came for.
I other words, be careful where you are going, inquire carefully about the national parks you are visiting and what you can expect to see. Only the private game reserves can provide the undisturbed safari experience, but also parks like the Masai Mara are great. Often national parks close to big cities are used for excursions for schools or big groups of tourists. Keep that in mind when you plan your trip.
Enjoy the wildlife and have fun with your photography.