I know many people will probably not agree with me but I was not impressed at all with the Seattle Aquarium. We went there with the Citypass and were so happy that we didn't pay the full price for it. We got there at 4pm, which was 1 hour before they closed and we were in and out in no time. I think the best thing about the place was the gift shop. They do have a lot of fish so if thats interesting to you, you'll be happy. So my advice is if it's included with the Citypass, it doesn't hurt to look. If you have to pay full price. Skip it.