Car, easiest form of transport in Seattle, especially that public transport is so expensive and is being reduced in service (claiming budget cuts), and our stupid major favors bicycles over cars (taking out good parking spots to replace them with bike lanes - adding bike lanes to pretty much every major street in the city - I don't mind the cyclist that follow the rules, a large majority dont, they cross the light in red, if cars wait so should cyclist we are sharing the road which they would follow the same rule, 99% of cyclist do it).
When I can't drive, I'll just walk down to the store, or I'll just walk up and down the hills for exercise.