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据美国国家公园网站最新报道，2012年美国国家公园将实行在规定时段内的免费开放日，哈哈，在美国的“穷人”有福啦！
免除的费用事项如下：Fee waiver includes: entrance fees, commercial tour fees, and transportation entrance fees.其他如预定费、宿营费由除国家公园以外第三方单位收费的项目除外： Other fees such as reservation, camping, tours, concession and fees collected by third parties are not included unless stated otherwis
Free Entrance Days in the National Parks
http://www.nps.gov/findapark/feefreeparks.htm
America's Best Idea - the national parks - gets even better with several fee-free days at more than 100 national parks that usually charge entrance fees.*

免费时段：

Mark your calendar for these fee-free dates in 2012:

    January 14-16
    Martin Luther King Jr. weekend
    April 21-29
    National Park Week
    June 9
    Get Outdoors Day
    September 29
    National Public Lands Day
    November 10-12
    Veterans Day weekend

参与此活动的国家公园（平时都是收费的国家公园）包括：

Alaska
Denali National Park and Preserve

Arizona
Casa Grande Ruins National Monument
Chiricahua National Monument
Glen Canyon National Recreation Area
Grand Canyon National Park
Lake Mead National Recreation Area
Montezuma Castle National Monument
Organ Pipe Cactus National Monument
Petrified Forest National Park
Pipe Spring National Monument
Saguaro National Park
Sunset Crater Volcano National Monument
Tonto National Monument
Tumacacori National Historical Park
Tuzigoot National Monument
Walnut Canyon National Monument
Wupatki National Monument

Arkansas
Fort Smith National Historic Site
Pea Ridge National Military Park

California
Cabrillo National Monument
Death Valley National Park
Joshua Tree National Park
Lassen Volcanic National Park
Lava Beds National Monument
Muir Woods National Monument
Pinnacles National Monument
Sequoia National Park
Whiskeytown National Recreation Area
Yosemite National Park