There are other good replies for where to visit in Seattle, but one more: I went recently, and we went to this Starbucks Reserve. Sounds really dumb, but it was really cool and unique relative to any coffee shop I'd been in. Nothing to go out of the way for, but if you end up nearby (there's stuff nearby), drop in.

Otherwise for Pike Place, we did a food tour. It was overpriced, but looking back we both felt it was worth it. Kind of get to skip lines and try a bunch of really great food. Touristy of course, but so what.