saltflatracer -
We've stayed overnight at a 1000Trails Naco Long Beach campsite last year. This campsite is near Seaview/Illwaco at the southern end of peninsula. We weren't impressed as we thought the campground and sites were too close and not well maintained. Not on the beach but a short walk will get you there.
Also spent a couple of nights at Sunrise Resorts (Pacific Holiday RV Resort near Long Beach. Too "sterile" for us - too close together - but clean. Again, the beach is about 1/4 mile away - a short walk but worth it once you get to it.
I'd check with
www.campgroundreviews.com to find out more about campgrounds in this area.
There are also a couple of state parks in this area but they probably don't have cable or Wi-Fi hookups.