[WASHINGTON POST]  NATIONAL HARBOR TO OPEN OUTDOOR ADVENTURE AREA JULY 10 As summer heats up and the kids continue their cries of constant boredom, there is a new family stay-cation option opening up July 10 at the National Harbor.  Calleva, a Poolesville-based company, has recently installed an adventure area with a wooden pirate ship, lighthouse and ropes course that includes a climbing wall, zip lines and a giant swing on high rope