Interesting information from the National Park Service:

"Congress approved a new law allowing loaded
firearms in national parks starting Feb. 22,
2010. That means people can openly carry legal
handguns, rifles, shotguns and other firearms
and also may carry concealed guns as allowed by
state statute.

Guns may not be allowed on shuttle buses,
ferries or boats within certain national
parks, depending on the state.

Other weapons such as bows, swords, and
pellet or BB guns are not affected by the new
law and remain prohibited by the National
Park Service."

Johnny Cash's song will have to change to: "Don't Take Your Bow and Sword to the National Park"