Since the zoo was open to the public, 365 days/year, free of charge, I wasn't too sure on what to expect. I was pleasantly surprised by the large size and diversity of animals available. There were feedings and shows for a lot of the larger exhibits, and educational facts posted everywhere.
Jutting out into the lake, Navy Pier gave an incredible view of the water, and parts of the skyline. The pier was lined with indoor shops and restaurants, including Garrett's (the popcorn is so addicting!). A small garden was upstairs of the shops, complete with fountains that jump water over walkways. Outdoors was actually more beautiful after sunset. At dusk, the Ferris Wheel was a stunning contrast to the low sun, and at night, it lit up the pier.