I did the South  Africa tour with Victoria  Falls add on in February  2013. The falls were in full spate and spectacular  although the water  was too high for a visit to Victoria Island. We had two very wet days in South Africa otherwise it was warm and sunny. It was noticeably warmer in Zambia and on the optional safari to Botswana.   The safaris in Kruger  park were amazing. If you can,  do all the optional game drives. I did both as well as the included morning drive. The sight of giraffes  appearing from the bush, and watching from our safari truck as a lion marched his four lionesses  past was unforgettable.