The reason California dive boats are weekend centric is because our boats are mostly filled with locals and we work during the week. It's not really considered a "dive destination" like Cozumel or other warm water paradise.
the Peace Boat specializes in local multi-days trips. Unless it's a hurricane happening, they don't cancel their outings. And they also go
to the further Channel Islands too.
Good to know, guys, thanks. An out-of-stater having to put in for a week's vacation (hence the Saturday to Saturday time frame, with a day home after to recover & unpack, that seems typical for many vacations), book airfare & a spot on the boat (and maybe rental gear), often books a few to several months in advance. We can stack the odds by booking particular times of the year & so on, but reliability of diveable conditions & the boat going out is key.
From what I understand, Great Escape Dive Charters out of San Pedro offers 1 to 5 day trips, so along with Truth Aquatics and the Peace that makes 3 options for multi-day.
Preparing to book a trip next year, I did some research, got info. from people on the forum, etc..., and put together a guide to picking a California dive trip destination, from my perspective, which I hope to post alongside a trip report if I'm blessed with a fine trip August 2016 with Truth Aquatics. I still tweak the details a bit. My point is, California has a long, irregular coastline, near shore & off-shore options, a range of conditions, and the sheer range of options was bewildering.
I ultimately chose to leave the non-diving family home, which opened up the path to a multi-day live-aboard trip. Otherwise I'd have planned Saturday to Saturday, diving Sunday - Thursday, Friday off with family, day boat trips while family did whatever. Once I saw reliable weekday boat trips might be problematic, Catalina Island with the option for shore diving at the park looked like the main viable option.
Especially traveling as an 'only diver,' and not great at social networking.
Richard.