Fort Ebey State Park is a 649-acre camping park on Whidbey Island. Set on the western side of Whidbey Island, Fort Ebey was constructed as a coastal defense fort during the Second World War. Its battery was dug into a high bluff and is great fun for kids, adult kids and World War II aficionados. Don’t forget your headlamp or flashlight. The park’s concrete gun emplacements and underground rooms are great for exploration. 
There are 25 miles of mixed-use walking and bike trails, and 3 miles of bike-only trails. 

Surfing is a popular beach activity, and paragliding is allowed.

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Campground is open March 1 - October 31 

http://parks.state.wa.us/507/Fort-Ebey