Hi there! My first post/reply!
Depends on which side of the city you are on. If out West, would suggest Hilton Falls (lots of great double track, and some challenging single track, and if silly and reckless -the toughest course in Southern Ontario, Bent Rim!), or if you want luxury and are up North, try out Hardwood (good enough for the Pan Am games, but easy enough for family fun)!
These are both pay parks (but not expensive), but north of Hilton Falls are many regional forests that have similar tracks… And are free. Dozens of km! But you gotta look them up!
Don’t know out East of city, but both are closer than where you went last time,
Hope you’re having a great time in your biking adventures!
TMS