Blake Island Campground is a boat-in marine state park on Puget Sound offering 44 standard campsites plus group camping, accessible only by private boat, kayak, or paddleboard from mainland launch points like Alki Point or Vashon Island.

The park features dock and buoy moorage (3-night limit, boats over 45 feet must use dock), flush toilets, showers, and a small park store, though visitors must follow strict pack-it-out trash policies.

Popular for kayaking, paddleboarding, boating, and shellfishing, with dramatic views of Seattle's skyline and the Cascade Mountains.