Thanks. It is about 2-3 miles south of Pt. Pinole. Keller Beach is just through the tunnel leading to Ferry Point, and is the very north end of the Miller/Knox regional park - http://www.ebparks.org/parks/miller_knox
I FINALLY developed my frames from April. All 4 were shot at Ohiopyle State Park and there were people moving around in each. I was hoping they were close enough to one spot that they'd show up, but only one does. I used a camera my husband got me for Christmas (not zero image, but a wooden box one). All are on Delta 100 and were around 8 seconds, IIRC.