I may in fact join you for part of your trip out west. If you are going to Kelowna BC, drop down to Washington State, then take Hwy 20 over the North Cascades all the way to Mt Vernon which is I-5 and salt water. I just might meet you in Kelowna and ride down and "back home" essentially. (Kelowna to Bellingham, WA is about 360 km)
Hwy 20 over the pass is amazing...it would be a shame to get this far and not ride it. (From the east you'll hit Winthrop, WA then head west on 20.)
Stop in Westport, WA where you can drive on the beach....you literally could put your front tire in the pacific....big long sandy beach there.
What month are thinking of hitting West Coast? Consider some less traveled roads in Central or Eastern Oregon, open space, nice uncrowded 2 lane highways through interesting terrain. Very different than the Fir tree forest corridor you get in BC, Western WA and Western OR. The Cascade mountain range changes everything .....coastal wet and forested with high population centers, or out in the open, dry and hot with few folks, if East of mountains.
Feel free to PM me if you would like to follow up with any info.