Opening and closing the face of the club too much during the backswing and downswing will cause you to hit the ball with the toe of the club
When playing a bunker shot play the ball off your front heel and make sure that you hit only several inches behind the ball so that the bottom of your swing arc is directly under the ball
This is an intimidating shot, but it can be managed easily by getting your weight far forward in your stance so that your sternum is above the ball at address