RCTgo

I am playing a custom scenario on the desert climate. I have loads of food and drink stalls, but peeps hunger and thirst bars are red. My stalls are busy, but wondering if it's because i'm offering the wrong types of food? Should it be plenty of ice cream and not hot food? 
Also i built an ostrich exhibit, with 2 paths leading to both viewing platforms. My peeps never went near it. I ended up deleting it because it was just a waste of space. Anyone know why they would ignore the exhibit?