Burke-Gilman Trail is a 18.3 mile point-to-point trail located near Seattle, WA and is good for all skill levels. The trail is primarily used for road biking and is accessible year-round.
Regularly ran the first portion (maybe the first third?). Well-paved; nice along the water, then turns urban pretty quickly, but all nice areas. An easy, mostly-level run (as long as you stay away of bikers around the many blind corners -- headphones not recommended).
Excellent Bike path if you live in Seattle and do not want to go out to the Country for a bike ride . A good ride after work