Between Mount Rainier and North Cascades National Park we spent a quick night boondocking at a Walmart in Arlington.  Normally nights at Walmart are straightforward, perhaps sometimes loud and unmemorable, but our vicinity to the Cascade mountain range delighted us with a superb sunrise as we set out that morning. And sometimes nights at Walmart are followed by pleasant nights in a charming, new campsite. Having done my research prior to entering North Cascades NP, I discovered that the Goodell Creek Campground (right outside the visitor center) was open and free by mid-October. It also wasn’t quite winter yet, so the…