It's illegal for an adult to bike ride on the sidewalk. The sidewalks are also quite narrow along my route and I can't imagine cycling at a decent speed and maneuvering around people on any of them. Heck, people can barely walk shoulder to shoulder together on one 2 km long section.
Along that same section of sidewalk, the road is one lane wide in each direction and I don't feel at all guilty cycling on the right hand side of it or taking the lane when it is safer. The max is 40 km/hr for most of the 2 km stretch but during rush hour, even I can easily keep up and not block traffic.
I see plenty of people riding on the sidewalks. Most are riding with their children, but I do wonder about the adults weaving on and off the sidewalk to the road. That looks much sketchier than riding on the road by a long shot.