Must do's in Jo,burg and Cape Town?

Before travelling up from SA to Kenya I have only 2 days in Jo'burg and 3 days in Cape Town.

I really want to see as much as I can in this short time and would love to know what you think are the must do things in these areas.

Joburg - Soweto tour? Pretoria trip? Rhino and Lion Park?

Cape Town - Robben Island? Hermanus whale trip? table mtn? boulder? winelands?

Also flights between the two cities - how reliable are the budget airlines?

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