For this location, you start out as in the map above, taking the 401 East to Pickering and turning north onto Brock Road (Durham Regional Rd 1), but you go past the Uxbridge/Pickering Townline, and continue another 8.5 km north.
Then, turn right (east) on Goodwood Road (Durham Regional Road 21) and travel 4.4 km. Turn right (south) on Concession Road 7 and travel 0.8 km. Turn left into the Durham Regional Forest – Main Tract. See map: Walker Woods and Glen Major Trail Map.pdf
Meet in the parking lot at post W4 on the map.