By Subway
The easiest way of getting to Walnut Creek for most who don't want to drive through a suburban wonderland is by BART (http://www.bart.gov).
By bike
By bike
For those who figuratively speaking prefer to put the pedal to the metal the old fashioned way on bicycle, the Iron Horse Trail runs North/South, neatly bisecting Walnut Creek into the west side where most of the stores lie and the east side where most of the suburban homes and strip malls are located.