How do you find the SOSA at San Dieguito Sports Field and Riparian?

I tried going to the San Dieguito Sports Field and Riparian for the Solitary Sandpiper but the gate to the sports field was locked. I didn’t want to be looking for it at the edge of a busy road, so I am trying to figure out how other birders have seen the sandpiper. I was at the entrance across from the Del Mar Horsepark on El Camino Real. Is there another entrance into the sports field I am unaware of? Or did everyone just stand in the grass at the edge of Via De La Valle looking in?   

Elizabeth Harth