If you are driving Kruger to J'burg you should really allow more time than 5 hours as you will be driving the spectacular Panorama Route driving past the Blyde River Canyon, Bourke's Luck Potholes, God's Window, Misty Mountain. At the very least stop for pancakes in Dullstroom or Graskop.
Waterfall Panorama Route:
Also we were told there were many more penguins in Betty's Bay than Boulder Beach and there were 6000 of them:
And you might consider a cocktail in Camp's Bay after Table Mountain. It has a very urban, hip beach town vibe, we liked it so much we actually came back the next day to look at possibly getting a condo there. Have fun, impossible not to.