Consider a quick trip north of the border across the Astoria-Megler Bridge and visit Cape Disappointment State Park in Washington. You won't be disappointed, despite the name. That whole area on the Washington side of the Columbia is where I've seen the most bald eagles.
At Ft Stevens, be sure to hike the trails back to the WWII gun emplacements. A lot of history back there and one most people miss.
As some have already said, Beverly Beach is highly recommended. It's a very in-demand state park, though. You might be able to get in during the week, but weekends are almost always booked. I prefer sites next to the stream and if you can get site B-12, take it just for the view of the sunset at your campsite.
Have fun!