Lots and lots of places to do that sort of thing once you get past Coos. There are many campgrounds that cater to the dune buggies and bikers and also your jeep. Winchester Bay has a huge campground that caters to the dunnies. Also Oregon Dunes KOA , Also Mrytlewood factory Both located just before you get to Houser. There are really just too many to name all of them. But the three I named are quite popular and no you will not have a problem with crowds. I know nothing of the Olympia area, except there are a lot of people that live there.
