• Coastal Defense Fortification: Originally built in the late 1800s as a strategic military defense, Fort Casey was designed to protect Puget Sound from naval threats. It was part of a larger defense system, sometimes referred to as the "Triangle of Death," which included Fort Worden and Fort Flagler.
• Military Batteries and Guns: The park features preserved military batteries and two historic guns – two 10-inch and two 3-inch models – providing a glimpse into the fort's past. You can walk among the structures and explore the underground bunkers.
• Admiralty Head Lighthouse:
   Built in 1903, the lighthouse is another significant historical feature. You can climb the tower and learn about the lighthouse's history from docents (when available). 

• Scenic Views: Enjoy sweeping views of 
  Admiralty Inlet
  , the Strait of Juan de Fuca, the Olympic Mountains, and nearby islands.
• Hiking Trails: The park boasts 1.8 miles of hiking trails, including access to the Pacific Northwest National Scenic Trail (PNT), according to Washington State Parks (.gov). The Fort Casey trail, rated as easy, is a 1.9-mile loop offering a mix of history and coastal views. Other options include the 
  Admiralty Inlet
   Loop (3 miles, easy) and the 
  Admiralty Inlet to Bluff Trail
   (6.7 miles, moderate).
• Beach Access: Explore the rocky shoreline of Admiralty Inlet, perfect for beachcombing, birdwatching, or simply enjoying the waterfront views. Tide pools are home to various marine life like crabs, sea stars, and colorful sea anemones.
• Bird Watching: The park is a haven for birds, especially during migratory seasons. Keep an eye out for bald eagles, scoters, loons, grebes, and other species.
• Boating and Diving: For those interested in water activities, there are boat launches for fishing, exploring, or kayaking. Diving is also available at the 
  Keystone Underwater Dive Park
   located off Fort Casey's shore.
• Camping: The park offers 22 standard campsites and 13 partial-hookup sites with a maximum length of 40 feet, notes the Washington State Parks brochure. Utility sites have water and electricity hookups, including four beachfront pull-through sites. Campsites are located next to the Coupeville ferry terminal. Reservations are available year-round and are recommended, especially during peak season. 

• Discover Pass Required: A Discover Pass is necessary for day visits to 
  Fort Casey State Park
   and other state-managed recreation lands in Washington. Passes can be purchased online or at the park's automated pay station.
• Proximity to Coupeville: 
  Fort Casey State Park
   is located three miles south of Coupeville. The nearby Keystone ferry terminal offers convenient access to Port Townsend. 

The Keystone Boat Launch is located within Fort Casey Historical State Park in Coupeville, Washington, providing public access to the Puget Sound. The launch features a floating dock, trailers, and a restroom, and requires a Washington Discover Pass or a paid day-use fee for access. The launch is a high-priority project for Washington State Parks, serving around 55,000 visitors annually and offering critical access for boaters on the west side of Whidbey Island.

Approaching the western shore of Whidbey Island from the Coupeville ferry, Crockett Lake appears just beyond the dock. Separated from Puget Sound by a tide gate, Highway 20 and the curving rocky beach of Keystone Spit, this salty end of the lake becomes brackish and nearly fresh as it moves northeast through the wetlands. To the southwest, the peaks of the Olympic Mountains rise from the horizon. To the north and east, the marshy, brushy shores of the lake give way to farm fields and patches of forest.