If you've never visited Seattle and you find yourself in the Emerald City on a sunny day (yes, there are sunny days here!) you will want to head to the to the top of the Space Needle, icon of the 1962 World's Fair, or hop aboard one of the ubiquitous Washington State Ferries - not as luxurious as those cruise-ship-like Greek ferries, but they provide unobstructed views of Puget Sound's expansiveness and beauty.
Seattle's better-publicized rainy days encourage leisurely explorations of the Seattle Art Museum or the waterfront Aquarium.
Those looking for something a bit different should try the free, self-guided trip I wrote about in today's The Seattle Times: Time Travel through Seattle I did it on a sunny day and again on a rainy day; either works.