Located on beautiful Vashon/Maury Island and a short ferry ride away from Seattle and Tacoma, Dockton Park provides a public boat launch, moorage, a playground, beach access, and picnic facilities on Quartermaster Harbor.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/king-county-parks/dockton-park/official-website/kingcounty.gov.md
Across the street from the [Docton] park is access to Dockton Forest, 86 acres of working forest land that is connected to Dockton Natural Area and Maury Island Natural Area, creating a network of 12 miles of soft-surface multi-use trails - including 3 miles of beginner, intermediate, and advanced mountain bike park trails.
https://kingcounty.gov/en/dept/dnrp/nature-recreation/parks-recreation/king-county-parks/parks/dockton-park-marina