What does an 'Exit Interview' typically cover?

I’m thinking of quitting my job, their practice is to hold exit interviews with each employee. Pretty standard stuff, but having only worked at movie theaters and pizza places before this I don’t really know what to expect and would like to know what kind of questions I’m up against and any advice on answers if I need to come back to it in the future.

I should mention, I hate that place (not the work, but the people). A lot. I’ve found numerous problems with management and employee behavior. I was told they usually ask if you have any ideas for improvement…should I avoid this topic and stay on their good side or should I be honest (and obviously nice about it)?