In zoo tycoon 2 how do you complete scenario 2 troubled zoos

The first two are extremely easy. Just do whatever they ask (clean up, expand space) and it is done. The last one is harder. It takes a lot of time. You must expand space and improve conditions. You must earn money to supply guests with restrooms, food, etc. while also making more enclosures to earn stars. Here's a tip: USE HILLS AS FENCES. Use them in the areas guests don't view through. It saves lots of money. Also, go sparingly with resources such as trees and toys.