Found an excellent new (to me) trail system where Walkers Line comes to a dead end north of Derry Road. Trails seem to be a mix of Bruce, Rattlesnake, Crawford lake and possibly also the Nassagaweya Trail systems. The map shown in the photo is clearly from the Crawford Lake group but doesn't show all the trails. It's frustrating but obviously they want you to pay to get here and so don't show the trail I took to get to this location (where Walkers Line comes to a dead end). Curiously, this same single trail entrance can also get you into Rattlesnake Park for free. Sadly, I suspect it'll only be a matter of time before this entrance is either closed off or manned to charge for entry.