When I commute to work, it's five-thirty in the morning, so I ride on the road with lights and helmet. But on my way home, it would be a death wish (literally a fellow co-worker died commuting to work a few years ago). There is no bike lane, so I use the sidewalk. On my ride home I only pass about 1 or 2 people on the sidewalk and I pass in the grass. In my head I'm trying to think about how many driveways there are and I really can't think of any. My only obstacle is a school that is letting out around the same time and that affect me either way. If I have to ride on the sidewalk, pedestrians have the right-of-way, period. Just be safe and be an ambassador for other bicyclists everywhere.