There's a decent amount of camping space/ area. It's accessed from highway 127. The dunes are little of course, but a fun little area. Mostly "finger dunes". There's the salt creek mines too. I put a bunch of info on those on the landmarks page.
A section of little Dumont got washed away last year but it didn't affect much of the sand. They just plowed the entrance but it's pretty soft still unless they did something about it since Oct 15th.