Heather, me and my mum Christine started our big Grand Canyon road trip by passing through (and having ourselves a time in) South Park, Colorado. It's not really a town, more a flat bit of land surrounded by mountains - or, if you will, a 'park' to the 'south' of Denver. There really was ample parking, and we got some groceries off humble folk without temptation.
By the way, if anyone knows how Kenny came back to South Park after being killed off permanently, my mum would love to know.