On the way you will cross a dam with small waterfall, see the
"right" tree:
You will also see a 5 armed Pine and several picnic tables. This
cache is hidden beyond the picnic tables in a black ammo box.
We started the cache with many goodies, like a CD, wiffle ball,
lighthouse, kite string, cup, and a dozen other items. The
following passage about the area was taken from the Wrentham
conservation guide found here:
Link
This 60.25-acre property combines the tranquility of a 20- acre
bog pond with striking 220-degree views of metropolitan Boston to
the northeast and the Rhode Island countryside to the southwest.
These breathtaking views are visible from the dramatic cliffs that
rise 150 feet from the pond's edge. The rock's 490-foot elevation
is the highest in Wrentham. Joe's Rock is just across from the
Birchwold Farm entrance—shortly before West Street separates
from Route 121—about four miles west of Wrentham Center. A
trail leads from the small parking lot to a five-acre meadow. The
pond, once a cranberry bog, flows southward to the Pawtucket
Reservoir and north to the Charles River. In the warmer months, one
can enjoy the area’s abundant wildlife and wetlands flora. In
the winter, the pond affords excellent ice skating opportunities.
Passing along the side of the the meadow, the trail rises through a
35-acre hillside to the top of the massive rock outcropping which
gives the area its name—said to come from a Native American
legend dating back to the days of King Philip Sachem's encounters
with the English settlers in the 1670s. The cliff has been called
the most interesting property in this corner of southeastern
Massachusetts from a geologic and aesthetic viewpoint. It is
accessible via two trails, one of which winds gradually while the
other is a shorter, steeper route. The property also contains a dam
on the pond's south side and remnants of an old stage road.
Here is a map of the Joe's Rock and Birchwold farms trails that
I found at the AMC Narragansett Chapter page:
Link