<p>A family enjoys the Green River in Mammoth Cave National Park
</p><p>photo by: 'Paddle Adventures Unltd'
</p>
mammoth1
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/42687493@N06">U.S. Department of the Interior</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/usinterior/9270304778/">Family Paddle Trip</a>