Johannesburg.

History
Apartheid Museum – traces the history of Apartheid (racial separation system) through to democracy through photographs, graphic videos, artifacts and other imagery
Constitution Hill – former prison, former military fort, now home to human rights court of SA
Gold Reef City – story of discovery of gold, replica of 1800 mining town; do an underground tour
Lesedi Cultural Village – looks at history and culture of 6 different African tribes, their traditions, music, dance and food
Cradle of Humankind – Sterkfontein Caves where Mrs Ples and Little Foot were excavated; explore the cave with a guide; Maropeng traces what it means to be human.
Soweto – visit SW townships, Mandela House, Vilkazi Street, Hector Pietersen Memorial, Chris Hani Square and Freedom Charter, Regina Mundi Church, Winnie Mandela House, Kliptown informal Settlement etc

Nature
Lion Park – guided game drive to see lions and other African wildlife
Croc City – crocodile breeding farm, zipline over croc ponds, reptile education, tarantula exhibit Planetarium – Southern Hemisphere night sky
Elephant sanctuary – elephant conservation, walk with an elephant, feed an elephant
Ann van Dyk Cheetah – cheetah conservation  etc

Fun and adventure
Gold Reef City – theme park, roller coaster rides; Maboneng – art, music, restaurant district
Acrobranch – high ropes course, longest zipline in Gauteng, Bungee – bungee between the Orlando Towers in Soweto
Cycling – bike tour through parts of Soweto with a guide etc