Yellowstone National Park
What role should the National Park Service play in promoting businesses that make a living off national parks? That's a potentially thorny question. On one hand, visitors coming from far off might want such information to help plan their trips. On the other, is the Park Service giving away free advertising and adding an appropriate commercial bent to its websites and press releases?
Quite a few U.S. national parks are listed as World Heritage Sites, and they're often in the news. There's a handy website out there run by the National Park Service's Office of International Affairs that can help you stay abreast of issues involving this sites.