The foremost mission of the National Park Service is to preserve the units of the park system, but providing for public enjoyment and education through interpretation is never overlooked. Helping drive both those missions at Big Bend is Friends of Big Bend National Park, a group that one day could be sponsoring a road or trail run and the next day spending the proceeds from that race on maintaining trails in the park.

Spring migration is winding down across much of North America, and it’s time for birders to relax and reflect. I’ve been contemplating happy thoughts such as where I would go if given an all-expenses paid birding trip to any U.S. National Park in the next 12 months. No one has offered this to me yet, but I made up a list in my head.

As lovers of national parks look forward to the 2016 centennial of the National Park Service—guardian of ”America’s Best Idea”—there has never been a better time to profile the rise and role of what may be our “Second Best Idea”—the friends groups, trusts, and foundations that support those parks.

In a guest column, Mark Eller, the communications director for the International Mountain Bicycling Association, explains why the mountain biking community would be a "strong partner" for the National Park Service.