The zoo is well-kept, if a bit difficult to navigate. I don't know that you could spend an entire day here, but it's good for an afternoon.
There is no fee to enter, but a map will cost you about $3. You don't really need the map, as there are signs located around the park. The zoo layout isn't the most logical, so you may need to stop and look every so often.
As this is a free attraction, expect a large crowd and to have to wait in line for your chance to view an exhibit. During my trip, the zoo was undergoing renovations and a lot of animals had been moved or just weren't out. It was sort of hit-or-miss on seeing an animal in an exhibit.
There are food vendors set up all over the park, so you won't have to go far to find food or drink. However, as you can carry in your own, I recommend just bringing your own bottle of water. The drinks are marked-up in park, of course.
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