Lord Hill Regional Park features 15 miles of hiking trails near Monroe, WA.
From Seattle: go east to 405. North on 405 to 522. Take 522 to the first exit in Monroe(164th, by the Penitentury) after driving over the river. Exit and turn left, after going counterclockwise in the traffic circle, under the road and head west on the Old Snohomish-Monroe Hwy. After about 3-4 miles, turn left at 127th(park sign there with arrow as well) and head up the hill. Trailhead is at the top. Maps available there and provided by the county.
http://www.tripleblaze.com/trail.php?c=3&i=843