If you visit the cheetah enclosure some time, be sure to go along on the guided tour. The guides explain what the cheetah conservation project is about and take visitors on a tour to see not only the cheetahs, but also the dogs, goats, jackals, and caracals.
After visiting the animals we had a picnic next to the dam at Spier. The estate allows visitors to picnic out on the lawn free of charge, but insists that you buy your food at the estate's well-stocked (though overpriced) deli. To be fair to Spier, they don't charge an entrance fee, and I suppose that the deli prices might be on a par with what you would pay at a restaurant.