If you're already planning your summer road trip based on how many national parks you can see, good for you. Supporting federally protected parks and wilderness means preserving places of nature and wonder for future generations. And part of that support means visiting our national parks legally.
In an effort to preserve native ecology, national parks like Yosemite, Yellowstone, and the Everglades can be very particular about the kind of activities they permit. Here's a list of the seven most important national parks laws.