I wonder why I don't see California marketed more heavily as a dive destination for tourist divers from elsewhere in the U.S. Instead of thinking of it as place people dive locally, or leave from to dive elsewhere, what's keeping it from becoming more of a place people from elsewhere travel to for a dive trip?
I get that it's cold water; so is the Galapagos. I don't expect California to knock Cozumel, Bonaire, Roatan, Belize or the Florida Keys off the top of the local charts, so to speak. But the seasoned diver who's been at least 3, maybe 4+ of those places, might be open to try something different. Yes, it's cold. Therefore, you've got kelp. And sea lions & harbor seals are a nice appeal. Diving in a different ocean is a perk!
If you're cold-tolerant and hit southern Cal. the right time of year, you can get by with a 5-mm wetsuit & gloves, plus hood (my hood & boots were 7-mm). Not so much, go 7-mm all the way. You don't have to be dry suit-capable to enjoy some California diving. It's expensive out there, but skip land-based & go multi-day live-aboard, and it's relatively cheap! More rustic than Caribbean live-aboards, but cheaper.
I doubt it'd be most dive tourists' frequent repeat destination. Not a Buddy Dive Resort (Bonaire), CocoView (Roatan), Rainbow Reef Diver Center (Key Largo), Scuba Club Cozumel, etc... But every few years for a mixed group or new & repeat divers, all seasoned? Why not?
Richard.