Can you reserve the campsites and how big are they?

Nice sites plenty of room don't think you will need reservation since it's off the beaten path.

No one was using the campsites when we were there. We didn't use them either. The caverns were worth the drive though.

You can reserve RV sites, but the primitive (e.g. tent camping) sites are first come first serve.

I think you can and I'm not sure on how big