Free Entrance Days in National Parks

U.S. National Park Service announces free entrance days in the National Parks.

Here are the free dates for 2011:

* January 15-17 (Martin Luther King, Jr. Birthday weekend)
* April 16-24 (National Park Week)
* June 21 (First day of summer)
* September 24 (Public Lands Day)
* November 11-13 (Veterans Day weekend)