Nicole
You will get as many places mentioned as replies.
It all depends on budget, availability and capability (or not) of
transport, and a host of other things.
To mention a few (in no particular order) ...
The bird hides at Ndumo Game reserve.
The solitude and beauty of the beach at Ponta Milibangalala
Kruger National Park in spring when all the young are being born
Deception or Tau Pans in the Central Kalahari Game Reserve.
Victoria Falls in full flood
The Afternoon cruise on the Chobe River at Kasane.
The haunting beauty of the copper coloured baobabs at Lekhubu Island in
the Makgadigadi.
And so on ....