Bells rarely work in the USA, as Americans are vastly ignorant of bicycles. I tried, and had more collsions with a bell then just riding off the pathway around them. (recommend a MTB for this) I may yell out "Bike Back!" or "Rider Back".

As for a racecar driver aiming the car for the accident scene, that isn't universally accepted paratice. You should aim for the rear of the car, as it that end should be going away from the front of your's. That and if you do hit, you won't hit the door and injure the other driver. I use this when beach riding with loads of cross traffic and have NEVER hit anyone.

When you ride upon a ped on the side of the road, pass to your left, the peds right. You're the legally recognized vehicle, and you should pass him like a car, assuming this person is walking correctly on the left side of the road.