For motorists, "There's no nice way to honk. Honking can startle a bicyclist and cause a crash, so only honk when absolutely necessary."
For bicyclists, "Go with the flow. Ride in the same direction as other traffic, and ride as straight as you can, don't weave between parked cars or into crosswalks."
With more and more people viewing biking both as a means of getting some exercise and helping the environment, their numbers will continue to grow. It's important they and the motoring public learn to safely share the road.