A gem if you know what to expect
I wrote a scathing review of this campground on Google, for no other reason than to discourage people from crowding it up and detracting from it's solitude. I'll be a little more generous here.
This campground is at the end of the Navarro River, where hiway 128 meets 1 just north of Point Arena. The only real "service" available here is port-a-potties. There are no hookups of any kind. Each of the 10 or so sites has a picnic table and a fire pit. There are no trees and no wind breaks, so you're kind of exposed. The beach has lots of character, tons of driftwood that people have moved around and made crude huts out of. The river is off to the side and flows out to the ocean, and is great for kayaking.
If you come prepared and have low expectations, this is a great spot. Don't expect to find any spots on weekends during the regular camp season. Off season camping is pretty light.
As a previous reviewer noted, it was closed for a time when heavy rains inundated the road in. It's been open for the last year, and they've even smoothed out the giant potholes that almost swallowed my Honda Fit.
If you stay here, don't be a cheap ass and try to camp free. Every time someone does that, it takes away from the funds available to keep someone on payroll to maintain it.
There is wifi provided by state parks for a nominal fee. Otherwise, it's in a dead zone for cell service other than SMS.