Cayuga Marsh is 45 miles from Cornell at the north end of Cayuga Lake, near Seneca Falls. From Cornell, go across Ithaca and the Cayuga Inlet to Route 89 north. After you pass through Canoga, watch for the entrance to Cayuga Lake State Park. Continue on Route 89 past that entrance for another 4 miles. Look for the railroad crossing. Stop here and park on the roadside. Follow the railroad tracks east toward Cayuga Lake into the marsh. (The railroad is active, but trains are infrequent.) The preserve is south of, but not adjacent to, the tracks, just before you reach the first small bridge.