NATIONAL PUBLIC LANDS DAYNational Public Lands Day (NPLD) is the nation’s largest, single-day volunteer effort for public lands. This fee-free day in many federally managed lands encourages visitors to volunteer conservation or enjoy hiking, exploring, fishing or camping their favorite public lands. Volunteers give back by repairing trails, collecting trash, or other maintenance needed around the parks. It's so great to hear .Well !I say good luck to them to utilize all public lands for well being society purposes . That's all!