This Saturday, September 29, National Park Service sites are offering free admission in honor of National Public Lands Day. The yearly event was started in 1994 by government agencies and volunteers to help protect and restore all types of public lands across the country. Now it is a tradition that draws upwards of 170,000 people to more than 2,100 sites to do work like trail building & maintenance, tree planting and general tidying up. The NPLD website has a search page where you can find out about volunteer opportunities in your area.

Other free days at National Parks include Martin Luther King weekend, Veterans Day weekend, and the annual National Parks Week (April) and Get Outdoors Day (June). Mark those on your calendar and enjoy some free fresh air!