Can't donate a cool billion? Well, the National Parks Conservation Association says that one of the best ways to support parks is, indeed, to visit one. Go even deeper by joining a citizen science project, like in the Great Smokies (dlia.org) or SoCal's national parks (researchlearningcenter.com). Or taking one of the American HIking Society's 50 Volunteer Vacations. (americanhiking.org).
National Parks Lifelist
The ultimate vacation in one of America's iconic parks requires the ultimate hiking plan: classic scenery, no crowds, and secret campsites. Here's how to spend a perfect week in Glacier, Yosemite, Yellowstone, Grand Canyon, Olympic, Denali, and the Great Smoky Mountains.