Cook Dungeoness crab (a couple inches of water in the bottom of the pot is fine, some or all of it can steam) for 18 minutes from when the water boils no matter how large or small the crabs or they'll be undercooked and therefore yucky.
The BF and I just checked out Ho Ho's fish on your reccomendation...it was a total mistake to order anything else. So good and primal-feeling! If you can, ask for some of the garlic-jalapeno stuff they serve their fried prawns with to go on the side....great flavor! Cost us just under $40 for the fish alone but it's good to live a little. Very friendly waitstaff. Thanks!
I STRONGLY recommended cleaning Dungeness before cooking them. I suspect a lot of people cook them alive and whole because they're squeamish about killing them, but suck it up. I think it's more humane to kill them before putting them in boiling water, and when you see what comes out of their gills, you'll be very glad you cleaned them. I split them down the middle (which kills them quickly and opens them up for cleaning), wash out the gills thoroughly, then cook.