Ecola State Park
“Wrapping around Tillamook Head, between Seaside and Cannon Beach, Ecola State Park stretches along 9 miles of coastline and offers outstanding sightseeing and recreation opportunities combined with a storied past.”
Here is the Park website. Phone 503-436-2844 Brochure OregonHikers.org
? Clatsop Loop Hike is a 3 mile gravel road and I have found some references implying some of it is wheelchair accessible. However, there is an elevation gain of 700 feet. The first 1/2 mile is not steep, but you need to call ahead to determine trail conditions.