Week-ends visits (Johannesburg)

Hi everyone !
I recently moved to Pretoria where I realized the expat community is quite small and the internation website not very active so I'm trying Johannesburg's. I barely know JHB and Pretoria area (only been once in the Kruger) and would be really interested by traveling with other expats on the week ends if anyone is interested. I don't have a car yet but will rent one soon so I will be able to move more easily. I'm thinking of going to any park/Cradle of Humankind/Cullinan Mine/whatever else. Would anyone be interested?