South Beach State Park is one of the major Oregon State Parks along the coast. It offers a day use area adjacent to a long sandy beach, and a campground with 300 sites, including 27 yurts. The park extends southward along the beach and dune land from the South Jetty at the mouth of Yaquina Bay.
The day use area offers a large parking lot, rest rooms, and a sandy trail over the foredune to the beach. The beach stretches northward a mile to the South Jetty, and southward several miles. The day I visited in mid-November 2018, the beach was broad and shallowly sloped. There were lots of finely broken sea shells, and few rocks on the surface. I found one small but strikingly colored agate.
South Beach State Park's main entrance is near milepost 143 on US 101. Google Maps.