On own last trip, 3 weeks long, we had to alter our plans several times due to sold out conditions. First off, one of our practices is to visit parks, places we haven't been to before and hate to make reservations at a new park based on a 2x2" pic (if even available) on the internet. Been burned enough times with bad sights to know better. Sometimes you just have to bite the bullet an get a KOA or other private parking lot style campground to tide you through the weekend.
We have found several great parks, what we call WDOS parks (Week Days Off Season) that are killer, but would be tragic on in-season weekends.
As we say the problem is that there far too many retired baby boomers with RV's flitting about from park to park (like us) and taking up all the campsites.
OH well, at least we can get out!!!