Find Ferry Road in South Windsor which is off Main Street which is off route 5. At the above coordinates you will find a sign giving the history of this area. Take the last 3 numbers of the date John Adams rode through here and subtract 86 to get N41 49.XXX.
At the river end of Ferry Road, at N41 51.789 W72 37.020 you will find a similar sign. Take the last 3 numbers of date the house was given to his son Nathaniel and subtract 501 to get W72 38.XXX.
These coordinates will take you to a small park at the end of Vibert Road. Near the first sign read the sign on the Post Office and as you drive to the cache area read the other signs along the way. Check out the Old Burying Ground "God's Acre" 1708.
Cache container is a small 3"x5"x7" lock and lock.