It is a nice place to visit although they are currently remodeling! I would wait until they are done remodeling to visit again. I went there about 2 weeks ago and was very disappointed that they had taken out so many exhibits!
i went there about 4 years ago and i can tell you it's great for kids. they have water life that can only be found in Washington state like the giant octopus or the sea dragon and i have been told that it's the biggest in the west coast.