We are a professional late 50s / early 60s couple new to the van life, and not RV-oriented, so we are a little careful about choosing sites with adequate peacefulness, space and privacy.  Cougar is a relaxed campground worthwhile as a base camp for the south side of Mt St Helens and its great lava tubes and forest hikes, so we ended up staying a second night as it had good hot showers, potable water, shade and friendly hosts.  Although our rented Cabana van of 19'8" had a toilet and shower onboard, we didn't need to use them.  This campground has available wood and sufficient space, and it's a 5-minute walk to a general store, gas station and restaurant, so well positioned.