You want good vis, eh? Well then, you're coming to the wrong place!
Compared to Cozumel, this is going to feel like black-out conditions on our BEST days.
I would encourage you to book a trip on one of our fabulous dive boats. Geoff already gave you a good link - here's another that compares all of the boats:
California Dive Boats : The Official Page
You may also want to book a private DM. I know that in Coz you're talking all DM-led dives, where you don't have to worry about your own navigation. The thing you need to know about diving in CA is that, unlike so many other dive destinations, our boats do NOT send you off with a DM. The DMs generally don't even get in the water. You are on your own. Every diver is expected to bring their own gear including tanks and weights (some boats do offer gear rentals, most don't). You are expected to plan your own dive, dive your plan, and get yourself back to the boat. They will not buddy you up - you are expected to come with your own buddy (although most DMs on a boat will help you find someone on board to dive with, even if it's joining as a third person - my husband and I have been asked on more than one occasion to bring a solo diver with us). The divers on the boat don't all go off together - they do their own thing. You will get a good briefing from the onboard DM, but you will not get guided, unless you hire one to dive with you for the day.
Alternatively, you can connect up with someone on the forum here who is going out on a boat that day and is willing to dive with you.
You should also read up on diving in kelp. There are all kinds of resources on the web - just google "diving in kelp" and read some of those sites. Kelp is not dangerous if you know a few basics (e.g. it breaks if you bend it, not if you pull it, and NEVER twist around), but we have lost more than our share of tourists who came here having never dived in kelp or done any reading on it, and got caught up in it and didn't know how to get out.
If the coldest water you've dived in is 60F, you are going to be surprised when you hit the water. 60 is downright balmy around here, and the water temps won't hit that lofty height for several more months. The water temps will be in the 50's, possibly even the low 50's. 7mm wetsuit, hood, and gloves are absolute essentials.
Vis is not good around here, in comparison to some of the places you've been diving. 15 ft vis is considered a good day. Anything more than that is considered a GREAT day.
But diving around here IS very beautiful. There can be lots of life - but not the brilliant colors you're used to seeing in the tropical waters you've been diving in. No coral. Rocks, kelp, lots of fish. Beautiful nudis, if you take the time to look for them. Kelp forests are magical.
Hope this helps!