If you haven't done it before, take a sea plane flight. It's the best way to see how stunning Seattle is. There are several companies that fly from Lake Union which is right next to downtown Seattle.

My wife and I are off to Seattle for three weeks in June/July on holiday. I've been there a couple of times on business and now I want to go back and see it properly...
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Remind me to change my signature to something more interesting someday