Well, Bob's nailed the Vancouver Island diving, and you've heard some about Monterey, and of course, you're there. But take a look at photos like this:
to see what awaits you there.
To get a feeling for Browning Pass, have a look at this photo:
Rapture of the Deep Photography | Browning Pass | Hiding in Plain Sight (Sorry, I can't embed, it's protected.)
I wouldn't downplay Seattle as a destination, either. Although we don't have the spectacular color and massive walls found to the north (although there are some pretty amazing walls in the San Juan Islands) what we have is very accessible diving full of fascinating animals. Giant Pacific Octopuses can be found within eyeshot of the downtown skyline. Grunt sculpins and Pacific Spiny Lumpsuckers have to be some of the strangest creatures anywhere.
(This photo courtesy my friend Bob Bailey)
And nobody has yet mentioned the spectacular diving off Southern California. The kelp forests, the Garibaldis, the otherworldly architecture of the oil rigs, the sea lions . . . oh, the sea lions!
(photo courtesy my friend Warren Lo)
(photos by my friend Ken Kopp)
And don't forget, when we are talking about the Americas, the cenotes of the Yucatan:
(image by my friend Scott Boyd)