We have been to Heaven's Corner three times. I think one of my children's favorite memories is "racing" with one of the big cats. As the children ran back and forth on the sidewalk outside the cage, the big cat raced after them.
Heaven's Corner has a wide variety of animals, and you can get quite close to them. It's not like a zoo, with wide expanses for the animals to roam in; these animals are in cages. I think most of the animals have been rescued either because they are injured or from owners who took on more than they can handle. There are birds, snakes, many types of big cats, kangaroos, and more.
If you're in the area, I recommend visiting Heaven's Corner.
(The date on this review will say April 2012, but I actually last visited in 2011. I wasn't able to choose that as an option.)