Potter Park is no San Diego Zoo, but they do have tigers, a lion, cheetas, monkeys and other large animals that larger zoos have. It makes for a nice day out with the kids. They have a large feline house that is home to the big cats I named above.
During the winter, they decorate the entire zoo in holiday lights. It is a huge hit locally, unless the snow melts, in that case the nearby river floods and the zoo is closed.
If you are a lansing resident, you get a nice discount admission. Be sure to check out their gift shop as well for a nice assortment of animal-inspired gifts.