Route: Seattle Olmsted 50k

The Seattle Olmsted 50 route runs 31 miles (50km) from the Ballard Locks to Rainier Beach Playfield, a feast of explorations through the heart of the 1903 Olmsted Park master plan. It dives in and around many of Seattle beautiful parks and gives a lovely tour of many of Seattle's vibrant neighborhoods.

https://www.mountaineers.org/activities/routes-places/seattle-olmsted-50-ballard-locks-to-rainier-beach

https://www.seattletimes.com/life/outdoors/visit-dozens-of-seattles-best-parks-on-this-olmsted-walking-route/