Bob Wheeler, left, president and CEO of Airstream Inc., Jackson Center,  Ohio,  welcomes U.S. Secretary of the Interior Ken Salazar, who visited Ohio’s  Cuyahoga Valley National Park Tuesday to announce several “fee-free  weekends” this summer at national parks. Airstream provided a travel  trailer  to be on site for the announcement. The initiative is designed to  stimulate visits  to national parks, which boost economic activity in  communities surrounding  parks. “Outdoor recreation is vital to local  businesses and to ancillary  industries like ours,” said Wheeler. “National  parks and access to camping  destinations are important to our customers.”  The announcement generated  more than 500 press stories, according to a  Google search by the American  Recreation Coalition which provided this  photo to RVBusiness. The “fee-free weekends” are valid nationwide at any park that charges an entrance fee.  Of the nation’s 391 national parks, 147 of them charge an entrance fee, ranging from $3 to $25. The admission-free weekends are: June 20-21 (Father’s Day Weekend), July 18-19 and Aug. 15-16.