|Put all those extra giveaway bean bag|
balls in your tennis cart bag of tricks
Pair players up. Each pair has one koosh/bean bag. One player puts the koosh on their racquet and tips it to the other player's racquet. If they tip it successfully without a drop, they each take a step apart and repeat. Soon they will be far enough apart that they will need to toss the koosh rather than just tip it onto the strings. Whichever pair successfully tosses/catches the farthest distance is the winner.
Adapted from USTA's QuickStart Guide handbook.