My favorite thing in Seattle is the Underground tour. There was only one when we lived there 44 years ago but I think there are several now. Seattle was built on a flood plane and when the roads kept filling up with water they had to build them up and covered up the first floor of all the buildings. Also the Chihuly Garden and Glass House is beautiful. Chihuly is a famous glass artist. If you like plants the Seattle Bonsai Museum is wonderful, some of those tiny trees are very old. The Asian Art museum is nice, they used to have an amazing carved jade collection.