You got a great list of places, so I'll just add some odds an ends for many types of photography. There is no order to this just thoughts of things I like in the NW.
I would second the recommendation to see the San Juan Islands. My wife and I got to see a killer whale pod come by the
Lime Kiln lighthouse on Friday Harbor. We were on shore because I think the whale watching boat tours are disruptive and probably harmful to the whales. You can watch the boats circle the pods, by law they have to keep some distance, probably a 1/2 mile or so, but the way they are followed is pretty horrific to me. Anyway, half the pod came up to the shore, the whales where about 50 vertical feet and maybe 15 horizontal feet away. They would even stop and poke their heads up to take a look at all the people. There were probably about 100 people on the shore that day.
In traveling the Columbia Gorge you might want to stop by
Maryhill Museum and the surrounding area. Coming back on 14 on the Washington side is a much different experience than driving up 84 on the Oregon side. There is an old decrepit spa, hot water from a geothermal source, on the way, but I can't remember the name.
If you would like to stay at a hotel that offers some of the flavor of Portland, I would suggest the
Edgefield. Be sure to try the beer. If you can, see something at the
Crystal Ballroom. I'm not sure how many floating ballrooms still exist.
My favorite beer is not a McMenamins', but a Deschutes Brewery beer called
Black Butte Porter. It is definitely worth trying if you like beer. There are probably more microbrews in the NW than you can try in 5 days, so might as well start with the best.
If you head down to Smith Rock, be sure to stop at Oregon's Mini Grand Canyon,
Cove Palisades.
In Portland you might visit the 100+ year old
Oaks Park although you'll be too early for Oktoberfest. I guess that would leave out
Leavenworth in WA too.
The
Arlene Schnitzer Concert Hall is worth a look. The
Rose Garden and
Pittock Mansion offer a beautiful view of Portland.
If you are planning on seeing Silver Falls, on the way there is the
Swan Island Dahlia Farm, America's largest dahlia grower. My wife and I used to hit it and the
Wooden Shoe Tulip farm every year.
If you are into birding there is the
Sauvie Island Wildlife Area. It is pretty close to the nude beach so be careful where you point your lens.
In Seattle: visit the Jimmy Hendrix statue on Capitol Hill or visiting his memorial, see
Lincoln's Toe Truck, visit Queen Anne and
Kerry Park too.
There is usually something happening at
Alki beach in West Seattle. The
Hiram M Chittenden Locks are really interesting. Don't forget the
UPS park on Second Avenue and Main Street. Who would have thought UPS started a 100 years ago in Seattle?
South of Seattle is Tacoma and the
Chihuly Bridge of Glass.
Heceta Head lighthouse has a great tide pool on the beach below it. The pools are full of starfish, muscles, and sea urchins. The starfish are red and orange and the urchins are a lime green, all in pools about 8 inch deep on top of dark basalt rock. The colors are fantastic
It is not in your driving distance, but
Crater Lake is one of the most beautiful places in the US.
Another site too far, would be Newberry National Volcanic Monument and the
Big Obsidian Flow. It also has the mile long
Lava River Cave . These to me are unique to Oregon.
I love the geology of Oregon, so much to see. Traveling
highway 242 is pretty interesting as well, as it gives direct access to a great lava field.
Too far still is the Steens Mountain. This
site, not mine, has some photos that provide an idea of the area.
Farmers markets are a great way to spend some time and money. Portland has its Saturday market that is a lot less farmer and more arts and crafts. The other Sat. market happens on the Portland State grounds in downtown and is more baked goods and cheeses, with a little vegetable. There is a Thursday's market that is pretty small and maybe doesn't exist anymore. Vancouver WA has a farmers market that is more open and less crowded, lots of people with dogs, lots of vegetables, a little craft.
You should visit
Powell's Book Store as it is the largest independent new and used book store. Catty corner to Powell's is a pizza joint, it is pretty interesting as well as most of that block. This block and Pioneer Square will probably offer some good street photography opportunities.
Also in the book category, the Portland downtown Central library is really beautiful as well as being the oldest library west of the Mississippi. Seattle has a new library and its modern look looks interesting to me.
In Vancouver WA, it is just across the Columbia River, heading out to
Frenchman's Bar can be pretty interesting when the large ships come in.
The 205 bridge on the Washington side is pretty interesting. There is a
bike path that starts under the bridge and I am always amazed at how tall the bridge is there.
I probably should stop. The one thing about the NW is the great food. You'll find all types of great food and most is not going to cost a lot. Stay out of the chain restaurants and you will eat very well.
Thank you
Russell