Dash Point State Park is your average, nice Washington State Park, with trees, grass, pathways etc. When we were there at the end of March, only about half the campground was open, and we were able to get a last-minute spot in the late afternoon on a Thursday. Sites are mid-sized, with some having more privacy than others.
Cons: While several other reviews talk of the cleanliness of the campground, we had the opposite experience, with large and small trash everywhere we walked (including a whole foam mattress thrown away). It was also pretty muddy, as well as loud (from the airplanes passing over head until the middle of the night).
Pros: Across the street, the day use area is amazing, with a lovely beach, picnic tables, hikes, etc. Generally a very nice place to spend the day.
Tips: Unless you're there with another group or family, avoid the spots that look like they're parallel on the map (9 & 10; 15 & 16 etc.) since they're basically one big site split up with two driveways right next to one another.