From Toronto, Take Gardiner Expressway and QEW west.
Keep RIGHT onto HWT 403 towards Hamilton/Brantford
At exit Fairview Dr, keep RIGHT onto Ramp
Turn LEFT (West) onto Fairview Dr
Turn LEFT (South) onto HWY 24 (King George Road)
Bear LEFT (South) onto HWY 2 [HWY 24]
Turn RIGHT (South-West) onto HWY 24
Turn LEFT (South) onto HWY 24
At Simcoe, stay on HWY 24 [Norfolk St N]
Passing East Quarter Line, watch carefully for a small Backus Woods sign on left
Turn LEFT (South) into narrow bush road to parking lot

On the way back you might wish to stop for refreshments/dinner in Simcoe at the Blue Elephant at 96 Norfolk St S.

Enjoy the hike and the day.