Mark your calendar for these fee-free days in 2011:
* January 15-17 - Martin Luther King, Jr. Birthday (new)
* April 16-24 - National Park Week
* June 21 - First day of summer (new)
* September 24 - Public Lands Day
* November 11 - Veterans Day
http://www.parkpartners.org/Special-...-for-2011.html
But also, many of the 394 national parks NEVER charge an entrance fee.
Tim