When I read the question, my first thought was for well-spaced, U-racks, so I agree with that. But I also agree with everyone that mentions keeping their bikes close to them. You are especially sensitive to bike theft when it's your mode of transportation, and it is very inconvenient to park your bike at a central location when your bike is holding all your gear. A couple of U-racks at or immediately adjacent to the campsites would be welcome. I would not expect them to be heavily used if the bikes had to be parked out of view of the owner.