The posted coordinates will take you to George's Tree Grove. It's actually one of many parks hidden in the middle of the residential area of Sanford.
At these coordinates you will see a map of the park which includes a key to the locations of all the different trees. The sign reads:
"The trees in this grove are the offspring of trees that stood as sentinels for our nation’s history, were planted by notable Americans, or grown on historic sites. Through these trees we commemorate the events and citizens that follow us in the hope that they will care for this land in the tradition set forth today."
To find the cache, look up these names in the key ...
A = Edgar Allen Poe Hackberry
B = Ellis Island Sycamore
C = Lindbergh Red Maple
D = Mount Vernon Red Maple
E = Ellis Island Sycamore
F = John James Audubon Hackberry
G = Mount Vernon Red Maple
H = Lindbergh Red Maple
I = John James Audubon Hackberry
J = Bartram's Garden River Birch
The cache container is an ammo can and can be found at N 28 AB.CDE, W 81 GH.IJF
I don't remember whether I left a pen in the cache so please BYOP just in case. Also, check yourself for ticks after finding the cache.