I use the sidewalk when....

1. A bus stop is near and I know the bus is coming
2. A police car is in the bike lane pulling somoene over
3. There is no bike lane
4. If the bike lane is crappy

Some people I know will ride opposite of traffic and wont ride in bike lanes because they are afraid to get hit. They don't know that going the wrong way will have a much higher percentage of them getting hit than not. I see so many bikers doing this that I just keep my mouth shut. I see people going in the bike lane the wrong way and I just want to tell them to get on the right side of the road, but that would just cause problems. The people that do these kinds of things are paranoid of getting hit by bad drivers usually.