looking at the photos and the lack of a defined trail anywhere it may be that someone really thought that hucking to the beach was a good idea. I could be wrong but....
http://www.sfgate.com/bayarea/article/Bicyclist-rescued-after-falling-off-cliff-3880886.php#photo-3482293
http://www.sfgate.com/bayarea/article/Bicyclist-rescued-after-falling-off-cliff-3880886.php#photo-3482293