I walked the same trail about four years ago. In a tent at the time. We got checked twice by the rangers for permits.
We got a little trail magic at the Light House. There was a couple of park ranger types there but the light house was locked up. We ask when the Light House would be open for tours? They said that it was not open yet, but if we wanted to wait until they finished ther lunch they would give us a showing. The older guy was training the young lady ranger on some of the history of the house. So we got a hour private showing of the light house.