Somerset Greenbelts is 6 acres of trails. A natural area with a system of maintained trails that connect to other open space sites including Westwood Highlands Greenbelt and Forest Hill Park. By following the signage system and using sidewalks you can hike throughout the south of I-90 greenbelt system. Go down Coal Creek (King County trails), connect with Cougar Mountain Wildland Park, then Squak Mountain, over to Tiger Mountain. Go up to Snoqualmie Pass, connect with the Pacific Crest or John Wayne trail, which will take you to Idaho, Canada, and Mexico.
Contact Dept of Parks & Community Services, 425-452-6885 (reference "Trail Guide")