Seattle is actually one of my favourite cities in the US, and I have been to almost every state.
There are beautiful views as well as some great food there, and wonderful museums. The Museum of Flight is especially interesting.
And if you are downtown don't miss Pike Place Market (NOT 'Pike's Place Market' as so many tourists misname it) I especially like visiting Piroshky Piroshky when they first open in the morning and buying some hot baked goods. It is right by the original Starbucks.
Please don't overlook all that the wonderful city has to offer in your excitement for
Disneyland!