Make sure you wear comfortable shoes! This zoo is huge. I grew up with the Honolulu Zoo & found that to be quite big but, the St. Louis Zoo is really huge! There were so many different kinds of animals that most zoos can't accomodate but, this zoo had really rare & unique animals that you only see on National Geographic. The zoo offers free admission but, there are many different themed areas which charge additional fees or you could buy a wristband for $30. Also the parking lot is $10. There is a train which tours throughout the park which along with merry-go-round is the kids highlight. They can go on as many times as they want with the wristband. The best parts for the kids were the baby tigers, "The March Of The Penguins" type penguins, the big bears, baby giraffes & bigger animals that they were able to see clearly & the petting areas. There is an artic area for the penguins which is something really special! There are snack bar areas but, the food is rather expensive so we bought a $3.00 bag of popcorn & stuffed ourselves till we were done & went to a restaurant after. We didn't get to finish the whole park because the kids were getting tired & hot but, we look forward to going another time! Also be sure to bring some spending cash because there are many gift stores thoughout the park with different themed things that your children will surely want!