Seattle has always been one of my favorite cites. I always get a sense of inner peace when I walk around the city. Visiting SafeCo Field to take in a ball game is always special so I would suggest a visit when the Mariners are playing at home. If you can get a dinner reservation at the Diamond Club you will not be disappointed. For sure spend sometime in the Pen area and soak up the atmosphere.
On this trip I stayed at the W. The property is right downtime and convenient to use as a base to walk around the city.
I highly recommend that you spend sometime at Pike Place Market. The scene is awesome and is a must see place. Check out the Space Needle and the Museum of Pop Culture is also a fun experience.
The restaurant scene is ever evolving and my personal favorites are Toulouse and Canlis.
For cocktails the W is awesome and my personal favorite is the Polar Bar which is inside the Arctic Club Hotel. Canon and the Bottlehouse are also worth a visit.
I hope you get to enjoy Seattle.