Exit highway 401 at the Harmony Rd. ramp (exit # 419).
Go south on Farewell St. to Col. Sam Drive.
Turn left (east) and follow to GM's headquarters.

You can access Second Marsh Wildlife Area, trails and viewing platform from the west parking lot. From the east parking lot you can access the main trail and the Dogwood Trail for the visually impaired within the McLaughlin Bay Wildlife Reserve.