My husband and I plan to spend 6 days in Portland OR, Vancouver BC & Seattle WA (2 days in each city) in the beginning of July. We have never been to this area before. We are in our late 50's-early 60's, and enjoy walking & sight-seeing, but aren't overly active. I would love some ideas of what we MUST see, the best areas (downtown?) to stay, and whether we should rent a car for the 6 days, or travel from city to city by train. Any other advise also would be appreciated. Thank you.