The campground at Pacific Beach is very very open, but RIGHT by the beach and you can see the ocean from these campsites. But these are clearly mostly set up for RVs.
Sofi running on the beach. This is right in front of the campers in the photo above. So there is a very very narrow set of dunes, but not much.
A different angle of those same RV's from the beach.
This shot is to the left of the campers, you can see the dunes here are a tiny bit bigger, but even still they are only like 25 feet wide and 200 feet long, not really big enough for capture the flag.