Take a shower instead of a bath.
You'll heat about half as much water.

Turn off the faucet while you shave.
You'll save on water-heating. Keep it off when you brush your teeth too, and you can save thousands of gallons of water a year.

Replace your old, noisy ventilation fan with a quiet, low-wattage, ENERGY STAR labeled fan.
It is very likely that if you can hear your fan throughout the house, or even in nearby rooms, it's an energy hog.