go to the sunshine coast, it's just before you get on the sea to sky highway that takes you to whistler. unlimited ocean beaches and lakes and mountains and no one else will be there. squamish and whistler will have more tourists but the chief and garibaldi are good places to start.
The Oregon Coast is beautiful, it's worth by-passing 1-5 and taking the long route along the way. Haystacks in Cannon Beach and seeing The Goonies house is chill, along with the puffins. And if you come through on the weekend, Portland's Saturday Market is full of lots of weird little shops and a ton of good street food. Highly recommended.