President Obama and his family are once again vacationing in a national park, this year choosing a quiet corner of America that for generations has served as a summer retreat for families with last names like Rockefeller, Vanderbilt, Morgan, Carnegie and Astor. The first family is spending the next three days on Mount Desert Island in northern Maine, home to Acadia National Park and some of the most incredible scenery in the Northeast. Acadia National Park - Mount Desert Island - Maine - United States - National park