Centennial Trail is a 2 mile lightly trafficked out and back trail located near Snoqualmie, WA and is good for all skill levels. The trail is primarily used for hiking and walking and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.
dogs on leash
Paved rail-trail along Railroad Ave. in Snoqualmie with railroad history exhibits
Short walk near the railroad museum in town. Paved trail good for a short stroll.
To call this a "trail" is definitely overstating things. It's a paved path along the side of the road, with old/antique trains on the other side of the path. There are some informative signs posted along the path, detailing the history of the various types of cars displayed as well as the history of that particular train car. If you or your child is a train buff, this would be a fun path. Also good for strollers or kids learning how to ride bikes. Note that the directions in the link above take you to a church. You should start at the Northwest Railway Museum and walk in the direction of Snoqualmie Falls. It's a pleasant enough stroll but nothing resembling exercise.