Some ideas:
1. Visit Cape Town -
they have a beautiful botanical garden called Kirstenbosch Gardens
Take the hop-on hop-off bus around the city
See the Penguins at Bolders Beach
Drive the Cape peninsula- the views are absolutely stunning
Take the gondola up to the top of Table Mountain
Visit Robben Island and see where Nelson Mandela was jailed.
There are a few timeshares in Cape Town, but I can recommend a guest house in the Tamboerskloof area called Underberg Guesthouse:
http://www.underbergguesthouse.co.za/index.html
Check out the offerings of Landscape Tours. I did a flower tour with them a few years ago and it was wonderful. It’s a 4 day or 6 day tour up the North western coast of the Country. The flowers bloom mid August to early September. The tour company offers a variety of tours. It would be great if you could do a tour while in SA:
https://www.landscapetours.co.za/
Visit Chobe National Park, Botswana
There are hundreds of Elephants in this reserve
https://chobenationalpark.co.za/
Visit Victoria Falls, Zimbabwe
https://victoriafallstourism.org/
In Johannesburg visit the Apartheid Museum:
https://apartheidmuseum.org/