Your first amendment rights begin here
The National Park Service performs an important role in preserving some of our wild areas for human enjoyment and conservation needs. Apparently, it also protects a small area to preserve our first amendment rights.

It is not a very big area, and if anyone were to take the park service up on their offer to host a demonstration, it would spill out onto the street pretty quickly. The speed limit here is only five miles per hour, anyway, so it is unlikely anyone would get hurt. I would add this to my sidebar as a nice reminder if it were not for one thing. I do not know if you can read it in this shot, but here is a close up:

How can you require a permit to use the first amendment?