You're talking about my backyard here.
Viz-wize, yeah it gets lousy here, but then when it gets nice, it's
really nice. I've seen it in excess of 80 feet. Three times. Not bad for 30+ years.
Shark-wise, I've seen Whites, had a seal taken in front of me by one and have been on large boats that were made
veeery small when they'd roll over and give you the eyeball. But that's because I'm out here in the green a lot. You can ask a thousand others and their sightings add up to zero.
Still I don't make it easy on the big landlord. I don't dive the Marin County, Fitzgerald or Moss Beach in San Mateo, I sure as hell stay clear of Ano Nuevo and Greyhound Rock and only if it's unreal at Scott's Creek. I don't wear the fish if I can swing it, but... and I'm not a big fan of jumping into a bunch of seals in the surf. And I do not, as in
DO NOT advocate the use or carrying of a bangstick, grenade, Glock or thermonuclear device here. The viz is the shits and it's going to be your luck to stick yourself, a rock, your buddy or a seal by accident or panic. I find that if you carry these things, you end up looking to use it. Better to dive in such a way as to leave the big boss his space and you go on your merry way. Way over there.
There are many other things that worry me more than a White out here, chief among them is me; then there's the other diver, the surge on that urchin-covered rock...