GR = Gilroy Hot Springs Casino.
To get there, just drive across the rickety wooden bridge . . . and figure out how to get past the locked gate and No Trespassing Sign. Can't get in? Too bad. You will have to make a (several) broken U turns on the bridge OR . . . drive backwards back across it. Did I mention a few wooden slats are loose and/or missing? Double dog dare ya to drive across. Awwww, what are you, chicken or something?