I sure wish I could see actual photos of their actual campsite, and where the grandpa was sitting, and where the boy was remembered to be. Lots of photos.
I'm just not picturing - at all - a camping area that appears "closed off" with "nowhere to go". All the campsites I've ever seen, and the aerial view ClaireC posted above, appears to me you could walk days in any direction and never be found. I don't see how you can have a "bowl" in the earth that a 2 year old can't get lost in, if it's wooded.
And creeks. From witness accounts, there are several creeks (or at least one). Why in the world is the sheriff so certain he didn't fall in? How can you possibly determine a child did NOT fall into a rushing creek, unless you find him somewhere else and determine it that way? He could have walked a mile down the creek, and fallen in, and it doesn't seem the sheriff has any call to say that didn't happen.