In the park near where I live (along the Humber River), cyclists treat the park like their own personal speed track.  And no wonder, when you are riding that fast you can't possibly see the signs that say 20 km/h speed limit or for cyclists to yield to pedestrians or pedestrian only paths or to walk your bike across the foot bridge.  I've been brushed by distracted, careless and "unempathetic" cyclists..usually they ding their little bells and expect everyone to get out of their way...sorry, but you want to ride like that, go on the road and you'll make the parks safer for the rest of us...especially women and children.