I know of a few good beach spots but they are mostly towards Southern California.
My buddy out of Sacramento likes this spot http://lawsonslanding.com/ABOUT/LOCATION.aspx
Here's what I do when looking for a new camping spot. I go on to rvparkreviews.com and find a beach city near where I would like to camp that has a campground listed on the website. The listing for that city shows all of the campgrounds in the city plus all of the nearby cities for about 25 miles that also have campgrounds. Then it's just a matter of reading through the reviews, looking at the campground website and map to find possibilities within your 2-4 hour range. RV Park Reviews is a great website for finding possible sots to stay in just by listing a city where you want to stay.
