I followed this Roadfood tip after a hiking trip. Sure enough, it's right there, downtown and easy to find. There was standing room only at 2PM. Still, it was well worth the trip. Despite a line, service came quickly and there were plenty of spots for sitting in the park across the road.
Best of all: a burger with great quality, at a price less than the fast-food places. If you're traveling through the area, get off the interstate and get to downtown.