In the summer, the ISC performs outdoors in the F.R. Newman Arboretum at Cornell Plantations (near the ponds and sculpture garden).
Get driving directions or set your GPS device address to "80 Caldwell Drive, Ithaca, NY". Both will bring you to the Caldwell drive entrance to the arboretum. Once you get there, just enter the Arboretum and follow the road up and over the hill. The performance site will be on your left, and parking attendants will be on hand to direct you to the appropriate parking areas.
On the map below:
Additional information is available from the Cornell Plantations Visitors Center at 607-255-2400.