Quoted:
The wife unit and I would like to take a trip to either Portland or Seattle later this year. We haven't been to either city, so don't know which one we should choose. Can anyone give some good ideas of what each city has to offer for tourists?
How long of a vacation are you looking to take and what's your budget? If you're talking a week's vacation, in my opinion (I live near Portland and visit Seattle a lot for work), neither city is worth a week of vacation. Can you do 10 days?
I'd recommend flying up to Seattle and finding 3 days worth of activities to do. Rent a car
Drive south on I-5 and take a day to visit Mt Rainier and Mt St Helens. You can do both in a day. Stay at a hotel in Woodland on your way out and back to I-5S.
Drive to Portland the next day and spend 2-3 days here. Is she a Twilight fan? You can spend a day visiting some of the major movie sites.
Spend a day/night at Mt Hood in Timberline Lodge.
Drive down to and see Crater Lake, Mt Bailey and Mt Thielsen. Spend the night at the lodge near Diamond Lake.
Drive to Eugene and fly back to California.
You could extend your stay a couple of extra days and visit the OR coast. Florence, Lincoln City, Cannon Beach, Seaside, etc.