My wife and I (no kids) are planning on visiting Omaha and we would like to see the Henry Doorly Zoo. Do you think we would be able to see everything at the zoo in one day? We are wondering if we should just plan on spending one day at the zoo, or split it up and spend a couple days there? We would probably get there when they open around nine and stay until close at 5 if it would even take that long. Thanks for the help!