The walk back to E1 Parking lot is about 0.5 miles downhill from the UW Quad.
After enjoying vendors and cherry blossoms in the UW Quad you will see a "Parking This Way" sign. Head out the east entrance of the UW Quad and follow the signs, walkways, and stairs, and Burke Gilman Trail and cross the second (north) walking bridge to the E1 Parking Lot.