Tell me what you did in Seattle and how you got to Vancouver.

[Weedy]

We bought the Seattle City Pass. It gave us a discount to many of the attractions.
We took the train from Seattle to Vancouver so fun!!

 

[Pooh2]

We did lunch in the Space Needle (get a reservation!) and duck boat tour.
We took Amtrak to Vancouver and had a day of touring there (horse-drawn trolley tour in the park, Capilano Suspension Bridge).

 

[Tasmen]

As someone that lives in Seattle, I'd recommend the Underground tours in Pioneer Square over the Space Needle. The Space Needle is pretty expensive just to take an elevator.

If you have kids with you, the Pacific Science Center (same area as the space needle) is super awesome. There is a room filled with butterflies and all sorts of other stuff kids would enjoy.

 

[RedSox68]

We flew into Seattle one day ahead of the cruise and stayed at Inn of the Market. We did Pike's Market and walked down the waterfront for dinner.

We took the Amtrak train to Vancouver and stayed at Pan Pacific for four nights -- did the hop on/hop off bus and went all around the city, got off to explore Granville Island, Stanley Park, Chinese Gardens. Loved it all. Were sure to stop at a JapaDog stand for lunch one day.

After the cruise from Vancouver (our's was a 7-day cruise with a 12-day land portion to Yukon territory, etc.), we were flown back to Vancouver and stayed at the Fairmount at the airport.

The next day we took the Amtrak train back to Seattle and stayed four more nights at the Silver Cloud Lake Inn and took their free shuttle into the city each day. Be sure to do the underground tour -- very interesting.

We rented a car one day (the rental place was at a hotel within walking distance of us). We drove to the Lewis & Clark Center in Oregon so that we could complete our 50th state!

We loved everything about that experience and consider Seattle and Vancouver two of our favorite cities now.