I voted for the parties, but I would lean towards the Halloween party instead of the Xmas one. Special fireworks, parade, costumes, candy(albeit not top notch). Plus you get 8 hours of admission for the price, not too shabby.
I chose QS based on the price I pay for QS type foods at sports venues, zoo, and similar places where I live. Plus, like another poster said, several QS places offer food beyond the standard burger and fries.