Johannesburg Bleg

A first ever KPC bleg! wow.

Mrs. Angus and I will be in Johburg for one day resting up from our flight there from OKC (via ATL) on our way to Madagascar. Any suggestions for a good hotel not too far from the airport and something to do for a half day or so in the town would be greatly appreciated. We have been to Blyde river canyon and Kruger and don't have time to really travel outside the immediate J-burg area this time around.

BTW, for the semi-adventurous traveller, I'd highly recommend South Africa as a destination.