At $15 a person this is a little too expensive.
When you go in there is a pool with dolphins that swim around and come up for you to take pictures. You can also go downstairs and watch them in the pool through a window.
After that you go in the secret garden with the big cats. It's very tropical there with grass, waterfalls, and lots of trees. While they seemed well taken care of their habitats seemed a little too small especially the leopard one that had four leopards in it.
Afterwards you can go to the gift shop and buy overpriced souvenirs with white tigers on them.
If you are staying at the Mirage and can get in free or have little kids, you should see it.