The treasure is not in a graveyard. Why did Fenn need to state the obvious? Well, we think a couple of his clues could be misinterpreted:
From there it’s no place for the meek,
the end is ever drawing nigh;
Could be seen as a scary place talking about the end / death.
He also alludes to graveyards in his book TTOTC on page 41:
“Sometimes, when it wasn’t too cold, I’d get even with my father for switching me by jumping out of the window by my bed and walking down to the cemetery, which was just a block north of our house. It took guts to go in there when it was dark with no moon. I still remember the sense of accomplishment I felt when I sat on some dead guy’s grave marker. I wasn’t even afraid. A kid really has time to think in a graveyard.”
The big question here, is do any of the clues in the poem refer to a graveyard on the way to a treasure?
Why? Well, Forrest has a huge incentive here on NBC to keep people from doing stupid stuff, and he knows how big the search has become… it makes more sense that this clue (along with other NBC clues) are designed to keep people and sacred areas safe . You’ve got to give Fenn some credit on his foresight when he initially wrote the poem… if you believe the search will go on for 1,000+ years, why take people through a graveyard on the way and risk destroying the hollow grounds?