Keystone Spit is a 274-acre undeveloped state park property located adjacent to the Port Townsend-Keystone Ferry Terminal and Fort Casey State Park, and adjoining Crockett Lake – a 250-acre shallow marsh. The site provides access to an extensive gravel beach, upland sand and gravel dunes, and the wetlands adjoining Crockett Lake
The upland portions of the site were originally improved with access roads for speculative vacation home subdivisions. Portions of the southeast end of the site were excavated for borrow pits and other gravel mining operations.
This portion of the undeveloped park provides picnicking, beachcombing, birdwatching, surf fishing, kite flying, windsurfing, scuba diving, and interpretive facilities.
Crockett Lake is an inland brackish body of water located north of Keystone Spit that has been acquired by the state for preservation. Old pilings and other remnants of historical shipping and rail activities are visible along the south shore of the lake. The Crockett Blockhouse site is located on private property on the northeastern shoreline. The lake has not been otherwise developed for water or park activities.