Our grandson loves the zoo so much so that we got a grandparents membership so that we could go anytime we wanted to. We live about an hour away so we can go and spend a few hours and not feel like we wasted money for not staying longer. We catch the feeding times and ride the train over in the farm area. We also love going over to the botanical garden side and looking at all the beautiful plants and flowers.
If you haven't visited Riverbanks before it's worth the trip.