Humboldt Bay!!!
Those are some storied waters! They have long held a tradition of waterfowling. From what I've gathered, from way up here in Oregon, is that the bay sees some serious pressure during the season from hunters, and an increasing number of anti-hunters. Seriously, it's become a larger and larger problem with confrontations.
Anyhow, I also gather that the hows and wheres and what not are closely held secrets because of the pressure.
All that being said, I hope one day to gun that bay. There are some very serious old timers down there that can be regarded as the current grandfathers of west coast duck'n.
I know this isn't very helpful. I hope you consider it encouragement to learn the hows and wheres and soak up all the experiences you can while you're down there.
Good luck!
Geoff