They leave as they’d arrived . . . vehicle by vehicle out the dirt-and-gravel-packed driveway they’d dipped down into a week ago. Tent, boat, kayak, paddleboards, bikes, duffle bags and towels, computers, coolers with huckleberries and cookie dough tucked inside—all stowed in the back, trailered, or on top. Pilot sits tall in his backseat, window…