During the evenings they have proper guided tours of the park. We went on one. It cost us R160 each.
We sat in a chair on a high Landrover and proceeded into the cold night.
The guide was very good, as was the driver. They seemed to know exactly where the animals were, as if they had asked the animals to be there especially for the tour.
They were knowledgable and friendly. This was a real treat. I didn't take a photo in the dark, not wanting to frighten the animals away!