Gold Beach is a beautiful. We had some really good family friends who lived there. They owned a dahlia farm, and all of the dahlias in my mom's yard came from them (sadly the husband passed away, but the blooms every spring remind us of him). There is a great jet boat ride up the Rogue Rivere there. We took my host-mom from Switzerland on it years ago, and she couldn't believe all of the wildlife we saw (deer, black bears, squirrels, etc). It was really beautiful...although loud.
The State Parks in Oregon along the coast are mostly near the highway. It is just the way things are out there. Everyone wants to be near the beach, but the road is right there too, so it is hard. I have found state parks further inland, that are further from main roads and really quiet (but then, anything seems quiet after life with a "full-of-life" 4-year-old).
The only exception I can think of, are some of the State Parks further north on the coast. There are a set of 3 near Tillamook, that are way off the main road, and on their own road, which really needs some maintence. One is one of Jenn's favorites (Nehalem Bay), there is one in the middle that I am blanking on, and then we stayed at Cape Lookout a bit north of that (last month). I wasn't impressed with Cape Lookout, and that is the only SP I have ever said that about, so far.
Enjoy the rest of your trip!