my wife and i went to seattle a while ago - it was great!
we planned our trip for when the jay's were in town - it was great to catch ball game (i hadn't seen the jays play live since we moved from ontario in the mid-80s)
we also got this:
https://www.citypass.com/seattle
it was fantastic - got to see lots of stuff and when you add up the cost of all the options the pass is a great deal.
we stayed in trent (i think) and just used the transit system to get into seattle and to get around - it worked fantastic. we didn't stay in anything fancy for a hotel since all we really were looking for was a place to crash at night