There is a level with birds carrying targets. You are told not to shoot the birds. When you shoot them, they will drop the target. If you shoot a falling target, you will get more points than if you did not shoot the bird.
At the start of level 1-1 (Ordon Target Practice), at the first stopping point notice the scarecrow on the ledge to the left. Before the first bullseyes appear, shoot the scarecrow's torso eight times. Its head will inflate. Then shoot the head once to explode it. You will get 1,000 points. Continue until reaching the second stopping point. A second scarecrow can be found at the second stopping point to the right of the house (on the top of the hill). Once again, shoot its torso eight times to inflate its head, then shoot the head once so it explodes to get 1,000 points. You will now be brought to a secret area at the end of the shooting session, located at the lake.
While playing a "Target Shooting" level, keep on the lookout for scarecrows. Once one is found, shoot the torso of the scarecrow 8 times. The head will inflate, allowing you to shoot it for 1000 points. Do this with the two scarecrows in the level (the second one will only appear if the first has already been shot), and instead of taking you to the default third area, the game will bring you to an alternative area, with more gold targets.