when my wife and i went we bussed into downtown (as others mentioned - parking is expensive)
we bought a 'citypass' - it was great - gets you into lots of stuff
http://www.citypass.com/seattle?crea...FQUFaQodfEkAhA
pike place is pretty cool. this is one of my favourite pics i got there...
if i recall correctly, transit in the downtown core was free too