The best starting point is at the end of Nook Road in Nickerson State Park, Brewster, MA. The coordinates for a limited number of vehicles are N 41° 45.123 W 70° 00.327. Park anywhere that does not block fire road access. From this spot there are 3 roads, the left, blocked by a gate in the winter,leads to camp sites and is not the best way. Either of the other dirt roads can lead you to the cache. Almost any fork or path leading in the right general direction can be successful with persistance.
If you find yourself in deep undergrowth or bull briars, you missed a better way.