In celebration of summer, the National Park Service will be waiving all park entrance fees during the weekend of June 5-6.  The park service will also honor this deal during August 14 and 15, September 25, and November 11.  This is wonderful news for those looking forward to budget travel this summer, as some of the participating parks charge anywhere from $3 to $25.  But while you will be saving on the initial entrance fee, charges for camping, tours and concessions remain in effect.