If you're going on a school day, while most schools are in session, it shouldn't be overly busy. No matter what, I would suggest making a list of what you want to see / do at the park and using a map to figure out how to go about it. The tip of starting in the back and work your way forward is HUGE, even if it is a school day.
Personally, I would say don't miss Wildcat, Demon Drop and Raptor (and of course, MF and TTD!)