Mr Slate is once again upset at Fred Flintstone. He asked Fred to do a simple task of finding the cache that he hid, and yet Fred failed. He just couldn't get to it and is asking Mr Slate for forgiveness. Maybe you can secretly help Fred find the cache so that Mr Slate won't be upset at Fred anymore. Afterwards, Fred can enjoy a nice brontosaurus burger along with a smiley.
[Hint:] Zntargvp Xrl Ubyqre.
[Spoiler:] [Tb qbja gb gur arkg yriry sebz gur ubyr ng gur gbc bs gur pbapergr jnyy. Ernpu haqre gur oevqtr, naq gura hc. Vg'f n oyvaq svaq nf lbh pna'g frr vg ohg unir gb srry sbe vg.]