Banff would be great, but it's rather infeasible. It's a 90 minute drive from the closest major airport (Calgary), and accomodation there is expensive (unless we went camping, which could be fun). Activities even slightly outside the town (like hikes) require driving, and I doubt that many/any would be bringing cars.
So my vote goes to Seattle, mainly because it has been most discussed so far, and I've never been there.
__________________
With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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