As you know, OR state parks are among the best in the country. Try a little quieter one like Sunset Bay. Tillicum Beach NFS CG and Beachside SP are right on the beach. The campsites away from the water are a little more roomy and private. There are also a variety of NFS CG's along the Oregon Dunes Seashore (no hookups though).
For seafood, try Waterfront Depot in Florence. If you're travelling solo, the bar is right in the dining room and you can eat right there. Well worth the stop (and the wait on a weekend).
I'm sure you've scoped out the mountain biking, but let me add a heads up for the Ossagon Trail in Redwoods National Park. Yes, a trail in a NP where mountain bikes are allowed! Still a very memorable experience even though it's been four or five years since we did it.
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