(Portland, OR) -- National parks are open for free today. The U.S. Forest Service is offering free entrance to all national parks today in honor of Martin Luther King Jr. Day. The fee waiver applies to day-use sites like picnic areas, boat launches, trailheads and visitor centers. Fees for camping, cabin rentals, and other permits still apply. Other free days are National Get Outdoors Day, Juneteenth, National Public Lands Day and Veterans Day.