If the campgrounds are under predominantly deciduous trees, you can try to get imagery from the winter - i.e. "leaf off". That may allow you to see the campgrounds.
Acquiring Infrared imagery may also be a possible solution, though getting that may prove difficult.
Where is your project site geographically? From the image you posted I am guessing the project is somewhere in the Western U.S.
Chris Donohue, GISP