This is fun for all ages and becomes very competitive.
Make 4 lanes (or more if you have larger group) approx. 10-12 feet long and 3 feet wide. Large width masking tape or duct tape works well to make these. Place a potato at the begining of each lane. Have 4 players at a time, one at each lane. The object is to roll the potato to the other end of the lane and then back to the start line. This is done by players on their knees with their hands behind their back and pushing the potato with their nose. This can be done with teams and each player on the team has to roll the potato and the team who finishes first is the winner.