Being the ice-cream addict that I am, monthly trips to DQ are a staple in my life. There's nothing really special about the inside of this location. It is small, the staff aren't overly friendly, it gets crowded because its one of the only fast food places around. The outside seating is where its at though.
There are about 5 tables that are in high demand. I suggest snagging the seats at your arrival and getting someone else in your group to order for you. The seats are far enough behind the restaurant where you don't feel like you're sitting in traffic, in fact, the view is pretty nice. There is a fair amount of greenery in this area.
As far as the icecream goes - its delicious. The ice cream cakes, too. If you like the blizzards, go to the dairy queen website and sign up for their "blizzard of the month club". You'll get coupons for free blizzards every now and then.