Yea there is some dunes by smith river, Calif. they are fun. We might check out the dunes up around Tillamook.Nice. There's a nice, calm OHV trail system along the dunes with campsites (sand camps). Tillamook also has OHV trails.
I've stayed at a couple places up there years ago- The Cannery was one, can't remember the other.
Went to the Rose Festival when I was in the Navy- lot of fun going up the Columbia on a 565' Navy cruiser.