Beware that parking is costly and sometimes hard to find. Some hotels have rent a car lots nearby and often will let you park there (at least I have done it years ago). You might think of alternatives given only 2 nights, based on what you decide to do.

There is a hotel (old) over the water, down by Pier 7x. People actually fished out the windows! A trolley runs the length of the road along the water and it is cheap. Walk one way and ride back or vis-versa. You have too little time to visit much more than the waterfront. Aquarium, boat ride (suggest to Telicum Villiage for the salmon bake and show), perhaps a dinner on the showboat a block or so away. Space needle is ok, and the Science Center/Museum is not to be missed. Lots of fun.