Lake Union is a freshwater lake in Seattle, joined by waterways to Puget Sound and Lake Washington. Gas Works Park sits on the north end of the lake, a 19.1 acre public park built on the site of a former gasification plant, with ruins and pieces of the old plant still standing and built into the park. The park offers grassy hills for kite flying, picnics, and wide vistas of the lake and city. The Burke-Gilman Trail runs along the northern edge of the park.
Seaplanes scoot in and out of Lake Union, on their way to and from the San Juan Islands and British Columbia. The lake shores are lined with houseboats, and commercial and private docks for owners and renters of tugs, yachts, tour ships, sailboats, kayaks and canoes. The Center for Wooden Boats is a nautical museum on the south shore, with historical boats, sailing events, classes and workshops.