From the N.Y. State Thruway

Take the NYS Thruway which is 87 N towards Albany and stay on it until EXIT 24 of the Thruway. It will come up about 5 miles after you reach Albany. At that point  the road divides into 90 East and 90 West. You want to stay on 87 N. Take EXIT 24 and you will soon come to a turn and then the tolls will appear.

After you pay the tolls stay on 87 N (Montreal) which is now the Northway.
Stay on the Northway for about an hour until Exit 26 (Pottersville/Minerva Exit).

At Exit 26 refer to the map above which is drawn to scale:

1) Drive to the end of service road and make a left

2) Continue on service road and you'll see a sign for Route 9

3) Take Route 9 South until you get to the Igerna Rd - Butternut Flats Rd intersection (2.4 miles)

4) Make a right at Igerna Rd

5) Drive 1.3 miles on Igerna Rd until you reach Perry Rd (Perry Rd will be the only right you can make on Igerna Rd)

6) Make a right on Perry Rd

7) Drive on Perry Rd for 1.1 miles and the cabin will be on your left (76 Perry Rd)