We went to Seattle in the summer and it was a nice time to go. But then again I'm in Socal and cannot handle cold weather. We did the underground tour which was really neat to see. I agree if you have the time drive to Vancouver it's a nice drive. I didn't know that you need a passport now. All my friends said that so far this year has been a bit warmer I don't know how the fall and winter is going to be though.