Many people have trouble hitting the sandbag over 1,500 meters. Yoshi is the best character to use for this contest. Jump above the sandbag and then press down A to dish out damage. Do this about four or five times and then swing the bat. The sandbag will go extremely far. If your an expert at this, you can probably get the sandbag to 140% damage. I got over 2,000 meters with Yoshi which is quite hard to do. You will also get the paper mario trophy and Yoshi's Island.