Five Guys is a great backyard burger. I would compare it to something my family would bbq up during the summer months. The down side is that it always seems to fall apart and the hamburger patty and bun NEVER seem to finish together. The last few bites are usually the bun with toppings.
The Cajun fries are yummy. A regular size feeds 3-4 people easily.
The soda machine is really cool. If anything, stop in just for that.