Stay at least 1000ft downwind whilst you check the strip is clear, use mimimum power on the approach and if the aircraft has a CS prop avoid selecting full fine until after you have reduced speed and power to avoid attracting attention to the aircraft as so many people do by selecting full fine downwind.
On takeoff if the aircraft has a CS prop keep the speed as low as you can by adopting a steep rate of climb; this has a twofold advantage of reducing the tip speed (rotational speed plus forward speed) of the prop (which is often far more irritating than the engine exhaust sound) and also the ground footprint of your noise.
Even without the noise issue from a CS prop a steep climb will still reduce the noise footprint.