We drove in on a super busy weekend at the end of August (right before school starts and during this pandemic where everyone just needed to get out) but were able to get lucky and fund 1 site that wasn't reserved for a night.  Sites are on the small side but fairly private.  Some choice sites are right on the late (and further from the road), but those will undoubtably be reserved so plan ahead.  This campground has a great (free) day-use area with a really nice beach for swimming/splashing and it doesn't get too busy.  I wouldn't probably stay here more than a day or two but it's a great stop-over as you head north towards the Olympic National Park or ocean beaches.