As said before, bikers can't use the sidewalk-- It's illegal.
Speaking as somewhat of a biker, I feel obligated to point out some realities...
Downhill, I can easily keep pace with traffic, and can usually brake much later in corners. So in that instance, speed isnt an issue.
Uphill is when problems present themselves. But in this instance, it is courteous for slow cars and bikes to do the same thing- pull over to the side as much as possible to let faster traffic go by.
Is it irritating to stop at red lights? Yes. But I do it.
Using sidewalks as alternative space for cyclists isn't a good idea.
Ie:
On more than one occasion, I have crossed the Golden Gate Bridge by bike. Pretty windy, but usually fun. Usually one side of the walkway on the bridge is reserved for bike traffic, and the other side for foot traffic. Once on the Marin side, you have to walk UNDER the bridge on a sketchy stairway to get to the vista point. During most times, the Vista point side is the Pedestrian side. My friends and I were lazy and decided to just skip the stairway and use the foot side. Oops.
Not only were we cited, but on several occasions we nearly hit people because we were simply going too fast. People (Ok, families and couples) tend to meander unpredictably, and the bikes are rather quiet with 25kts of wind whipping around. Inevitably, you jam your brakes just to avoid running down a 5 year old with a dog leash. You get annoyed, mutter "Excuse me", they glare at you, and give you JUST enough room. Heated by your unpleasant interaction with Tourist A, you pick a taller gear, and try to put your head down to just get away from the situation. Less than 2 seconds later, you're presented with the same situation. Bikes and people dont mix.
Alternatively, the one or two people who braved the "bike" side of the bridge were cursed at frequently. When Mr. SoftwareDesign is going 30+mph on his Cervelo R3, and all of a sudden encounters a pedestrian doing about 2, Mr. Software design gets annoyed. You've blown his cadence, and now he has to go into the wrong lane to pass whoever it is- usually an entitled tourist who is simply "Too Important" to walk with the plebeians on the other side. The person in the other lane (me) is annoyed, because now they have about a 50 MPH closing speed with very little in terms of protection. I lean on my brakes, and dive into the wrong lane, but stop to avoid the people. Mr. SoftwareDesign shouts an expletive, and gets back on his cadence. Meanwhile were stopped, glaring a tthe pedestrian, who isn't bothered that the situation I'm in (Stopped on the uphill crest) is extremely irritating.
Common courtesy says that if you're on a narrow road and holding up 3 or more cars, you should pull over and give the pass. On twisty-er road I tend to ride in the middle of the lane, which I am legally allowed to do. Usually if I hear traffic come over, I move over in the lane, and they make an illegal pass around the double-yellow.
Bikes should be treated as other vehicles when on the road.
On the other hand, bikes aren't pedestrians and CANNOT ride in crosswalks, or sidewalks.
Most actual bikers (People riding bikes which are somewhat expensive, wearing spandex, helmets, etc) are fairly respectful and will pull over. Occasionally you'll get one who isn't so much, and it's irritating, but you just have to deal with it like a slow or irritating driver.
Under no circumstances should you go out of your way to hit a biker. They have multiple, expansive special-interest groups, who usually have good lawyers. And, you know, running people down just because you dont think they should be on the road is silly.