Alexander,
I'm kinda surprised the guy at the park entrance hadn't seen more people make it. Seems like there are a number of crazy freak cyclists there. When I was last there a few years ago there was a small group just starting up and 2 or 3 coming down. I wonder what the strava kom is on the way down, especially their top speed.
Great accomplishment. I'm glad to hear visitors support it. I bike in an extremely busy park in the mid Atlantic and people are not as kind in the park.