Here's a fun summer time playgroup activity. Have your kids search your yard, neighborhood or park for some fist sized rocks. Bring them home and paint them using craft paint. You could make the traditional X and O shapes on the rocks, paint them a solid color or get creative with any other two designs. Use chalk to draw out the tic tac toe lines on your own driveway or sidewalk and then teach your kids how to play. The first to have three of their rocks in a row wins! Store your rocks in your flowerbed or garden and use them next time the playgroup is outside.