You will need information off the historical sign and an understanding of English grammar to figure out the location of the actual cache.
There are 6 lines on the Historical Marker.
N 43 AB.CDE
A = Verbs in first line
B = Consonants in line 3 word 4
C = Letters in line 4 word 3
D = Nouns in line 4
E = Vowels in line 5
W 77 FG.HIJ
F = Words in line 2 that end with a consonant.
G = Verbs in line 3.
H = Words in line 6 that start with a vowel
I = Words in line 5
J = Letters in second word of line 6
Actual cache is located on a little used trail a short distance away in Pittsford.
Have fun and enjoy.

You can validate your puzzle solution with certitude.