Necklace Valley is a 17.8 mile out and back trail located near Skykomish, WA. The trail is good for all skill levels and primarily used for hiking. 17.8 miles 3200 feet Out & Back hiking Expand Map Sign up now to see this map! Reviews (1)Photos (4)Recordings (2)Hoai Le2 months agovery hard hike. did this loop 2 years ago.