On Saturday, the National Park Service, U.S. Forest Service, Fish and Wildlife Service, Bureau of Land Management, and Bureau of Reclamation will all offer free access to their public lands, according to a press release from National Public Lands Day (NPLD). The annual NPLD is the largest one-day volunteer event for public lands in the United States. It’s meant to encourage maintenance of public parks and trails.

NPLD encourages volunteers to participate in events that include:

Building and caring for public trails

Planting trees and plants

Collecting invasive plants

Picking up trash

This map by NPLD outlines specific local volunteer opportunities by state across the country.

“National Public Lands Day is a great day to not only explore your public lands, but also an opportunity to take care of them by volunteering for one of the many programs available throughout the country,” Cristy Brown, management support specialist for Mesa Verde National Park, told Outside in an email. “Whether it is helping to clean up a beach, remove graffiti, or repair a trail, there is a way for everyone to get involved with taking care of these special areas.”

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