This is a very large park, not just a zoo, and you can get lost or waste a lot of time if you try to walk around on your own. Definitely take a tuk-tuk or taxi and ask the driver to take you around.
Clearly this place is on a low budget. The enclosures are rusted and not very well kept, and the animals don't always look very happy. But this is a poor country, and instead of telling potential visitors to stay away from it, I would say : go and visit the place, donate generously and show your encouragement.
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