If you are going to be in the Seattle Center area add the Gates Foundation to your list. There is no entrance fee and in their welcome center you can see all the projects they are funding world-wide. It is fascinating.
Theo Chocolates is in the Fremont district ('The Center of the Universe'), about 5 miles north of the Seattle Center. You get a tour of their factory, and many, many, many samples of chocolate. So you'd have to figure travel time (and parking in Fremont!) into your time in Seattle. It is very interesting as they do discuss how cocoa is grown, harvested, etc., and their approach to sourcing the cocoa for their chocolates. Did I mention the free samples? ? ?
- Rita