Very washboarded road to get up, we did not search further than the sign stating the camping point along the road. Camped at the first pull-off we saw. Quite a bit of traffic along this road, but still get a decent amount of privacy and views of the valley / Mammoth Hot Springs. We got in late, but I believe there are some more sites further down the road. At the spot we stayed I would say about two people could camp there.
As always, PLEASE clean up after yourselves. I always find too much trash at campsites, like I did at this one. Also, I noticed a bunch of old bathroom wipes, please come prepared for proper waste disposal.