We use to go to DQ every Friday for a quest burger. Since the birth of our 2nd son, we stopped. There is very little for him to do there. I have seen so many little hearts broken, because the child didn't meet height requirements for the Buzz bumper cars.
Here is what a small child can do:
5th floor----skee ball, video games if you hold them up
4th floor----kick the soccer ball, play video games if you hold them up, watch the computer at the cheesecake factory dessert area
3rd---play video games if you hold them up
2nd---(maybe play aladin)
1st---gift shop