Just found the illeagal prohibition of firearms in Island County parks.
http://www.islandcounty.net/code/CountyCode.htm
http://www.islandcounty.net/code/documents/ICC09.pdf
Title IX - Public Peace, Safety, and Morals
9.40.320 Firearms, Weapons, Hunting Prohibited
No person, except duly authorized law enforcement personnel, shall possess a firearm in any park area. No person shall discharge across, in, or into any park area a firearm, bow and arrow, air or gas weapon, or any device capable of injuring or killing any person or animal, or damaging
or destroying any public or private property, except, when the department has authorized a special recreational activity allowing such use or uses.
(Ord. C-44-90, adopted April 9, 1990, effective May 15, 1990, vol. 31, p. 60)