The Tahkenitch beach area is one of the most difficult to access on the Oregon Coast, which, in my book, makes it one of the best. It's located just north of Reedsport and the Umpqua river mouth. The area is similar to the more popular dune areas near Florence, Eugene's beach town, sans dune buggy's and crowds.
I did the 6 mile loop via Three Mile Lake, there are other options and entry points. I camped above the lake with a few of the ocean about 1/3 of a mile off, across the Dunes. Coming via the desert made the coolness a relief and pleasure. Walking near the surf near dusk was a study in the sublimity of so many near shades of gray defined most clearly at the horizon between a gray sea and a gray sky. A portion of this beach is open to vehicles, but the rather cute couple cruising by on a pair of clam digging equipped ATV's was not a distraction.
This one is worth doing again, with sun next time, for a study in contrast.