What I found a little confusing was the array of options and not knowing more about what the OP wanted.

Hi all... thanks again for all the feedback. We have decided to forego an excursion to Victoria because of the passport situation. Agree that it’s not worth the hassle and money to expedite. To clarify, we are flying into Spokane, renting a car and driving to Pullman, and we’ve decided to visit Portland and Seattle, ending in Seattle because we fly back from there. We will be leaving Pullman on Sunday, 8/5 and we flight out of Seattle on Monday, 8/13. I’ve taken notes of your suggestions, but if anyone has any suggested itineraries/routes for these destinations, I’d be most appreciative. You guys are great!

Sure, it's fairly easy.

Personally, I'm not fond of the heat you're likely to encounter in eastern Washington and Oregon, so I'd make tracks fairly quickly to the Hood River area along the Columbia. While there's no guarantee that it will be a lot cooler than the east (ought to be, but the Gorge can be hot, too) the benefit of Hood River is that it's very close to lots of outdoor or water-based activities, as well as lots of kid-friendly day trips. With a base at Hood River (my own fave is the Best Western Hood River Inn right on the river) you can do day trips to Timberline Lodge on Mount Hood, across the Columbia to Trout Lake with its views of Mt. Adams, drive the "fruit loop" to fruit stands, U-pick farms and orchards, wineries, etc. in the (beautiful) Hood River Valley, and visit places in the central Gorge like the Bonneville fish hatchery (really cool - don't miss it) and one or two of the more accessible (post-2017 fire) waterfalls. Visit Maryhill Museum, watch the wind surfers, kite boarders et al on the Columbia, walk around Lost Lake with its view of Mt. Hood... there are several days' worth of experiences all quite close together. Here's a map showing where places are, not intended to be a specific itinerary - https://goo.gl/maps/LY8Twhk7JJD2

Then you're just an hour from Portland. You might ride the gondola up to the Oregon Health Sciences University for great views of Mt. Hood, visit Powell Books, sample the many very cool food trucks... Then on to Seattle. Note if you want to "steal" a day from the Gorge/Portland time and do a day trip out to the coast, that's quite doable. My own loop (which is a full but rewarding day) looks like this - https://goo.gl/maps/JGEgnZabRzA2 - which includes Ecola State Park and Cannon Beach, historic Astoria, and the wonderful Cape Disappointment State Park on the Washington side of the mouth of the Columbia. Travel on the north shore of the Columbia in one direction or the other - historic and scenic and IMO more pleasant than the routes through Oregon.

With eight days I'd split them up with three nights in Hood River, two in Portland and three in the Seattle area. As you've been told already, hotel prices in Seattle are totally nuts, so consider staying outside of the downtown area and commuting in. If you want ideas on how to spend your time around our fair city, there are umpteen threads covering the options.