Any suggestion regarding sightseeing tour operator?

[RandallWolf]

Hi everybody, this is Randy. I am on a trip to South Africa for a month along with my family and want to visit Cape Town, Johannesburg and durban and few other cities out there. I have booked hotels through asiarooms (dot) com in these three cities, but looking for a reliable tour operator for sightseeing in South Africa. Any suggestions regarding this would be helpful.