First of all! I would make the hoofstock paddocks more accessible to visitors, and also replace the fencing. This area would be my main area for improvement. I would tidy up the Flamingo area and improve the housing for the Ostrich. I would then move the camels over with the Przewalski Horse, to create quite a nice asian area. Other species such as Wallaby and Deer, I would leave in that area.
In the spare Camel enclosure I would then bring in a pig species. Maybe Red River Hogs. Develop the enclosure etc. I would update the artic fox, polecat and Rhea/Cassowary? (Species unsure) and add a few more unusual species.
Extend the reptile house, to include the Tortoise Paddock.
I would then close the petting zoo area, move out all the domestic species and use this space (and indoor area) for a small antelope species. Or maybe even a new primate species.
I would also update the Bear enclosure, a quick tidy up.The last area I would work on is the long slope with the ?Vultures? and Red Squirrels. I would develop the paths, and re-build the enclosures. Another thing I would do is develop the outdoor Chimp area, with plenty more climbing oportunities and and lots more vegetation!
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I bet you a wondering what I would keep hey?

Well, I would keep the Sealion area, Penguins, Margay, Marmosets and Tamarins, Parrots (maybe with a tidy up), Tigers, Snow Leopards, Meerkats, African Aviary, Red Pandas, Gibbons and Spider Monkeys.
If you havent noticed, Im a bit of a perfectionist! But I believe this zoo has alot of potential! Just needs the money!