Not this woman! Way too much time finding one, parking, walking in. Gack! I'd rather go in the woods along some road, if need be. As a camper and avid backpacker in my youth, I'm well-versed in the teachings of your book.
Or get a pack of gum to use a gas station/convenience store facility. Toilet paper on the seat protects good enough and, really, women don't need to actually sit.