The campsites here are spaced out well. We camped with a group (3 other sites) and didn't feel cramped. The waterfront is nice with a large swimming area. It wasn't noisy even with heavy boat activity on the lake. We have also gone in the off-season and enjoyed the peace and quiet here.
Be cautious with a larger RV - our 5th wheel is 36'. This park is older - not a lot of room to maneuver or get out if you have a larger rig. The actual campsite might be large enough for you, but getting there or getting out might be a challenge - especially if you get there at night. We enjoyed biking on the paths to the water and hiking to the bridge. Also, the park is periodically noisy due to the close location of the Whidbey Island Naval Air Base.