Control your speed and obey speed limit signs. Because sound carries farther over water than land, especially at night, you should keep voices, music and other noises to a minimum if anchored near a waterfront property. Control your waste Pollution laws prohibit throwing refuse into the water. Carry bags aboard and dispose of waste and garbage properly. If you see floating refuse in the water, take the time to pick it up and dispose of it upon returning to shore.
Many bodies of water have no-discharge regulations in effect.
It is also the responsibility of the operator to refrain from careless, reckless, or negligent operations on the water. Failure to operate a boat in a safe manner could endanger life, or property of other persons. Again, be courteous and exercise caution. The best way to become a safe and diligent boater is to use common sense. If it doesn't make sense to do something on land it probably doesn't make sense to do it on the water.