They’re interesting places. You have to leave your man-toys at home, though.
Not anymore. The federal firearms ban in national parks was repealed in 2010 and now parks follow state rules. The ban on firearms in federally owned/operated building still exists, though, so you can't take them into the gift shop.
Still wouldn’t want to explain smoking a bear in a national park - given a person knows the risk and purposefully put themselves in that situation.