Take the No. 168 bus (métro McGill or Victoria Square), or the No. 12 bus (métro Lasalle), and get off at the end of Île-des-Soeurs Boulevard.
From the Champlain Bridge take the Nuns' Island (Île-des-Soeurs) exit. Get off before the bridge if you are coming from the north, or after the bridge if coming from the South Shore. After the first stop sign, go straight ahead and keep right. Turn left onto Île-des-Soeurs Boulevard and continue until you reach the end.