As in previous years, entrance fees are waived on select dates in the nation’s beautiful national parks. In 2013, free days will be January 21 (Martin Luther King, Jr. Day), April 22 through 26 (National Park Week), August 25 (National Park Service Birthday), September 28 (National Public Lands Day), and November 9 through 11 (Veterans Day Weekend). Savings could be from $25 to $50 per family.