Directions to the parking lot in Harriman State Park from the Tappan Zee bridge:

From Tappan Zee bridge, take Thruway north to exit 13N for Palisades Pkwy N toward Bear Mtn

Take the Palisades Pkwy N for 15 miles

Use the left 2 lanes to take exit 18 toward US-6 W/NY-17/I-87

At the traffic circle, take the 3rd exit onto Seven Lakes Dr.

Silver Mine Lake parking is a mile down Seven Lakes Drive on the left.