I don't get to layover at SEA much since its my home airport, but if I did I could kill hours sitting at the large windows in the newly refurbished pacific marketplace area. There's a great view of the ramp and runways with plenty of action.

Nowadays I always get to the airport at least an hour earlier than normal just to sit there for a bit and watch planes take off, land, park, and all the ramp action (I have yet to see a Menizes mistake though).

- VxG