Chalk is not just for inside fun...Take it outside and PLAY!!
Remember the days of Hopscotch? Make it a longer game by drawing 20 squares instead of the usual 10.
Have a jumping contest and see how far each person can jump from a designated spot. Use different colored chalk to make each person's distance.
Draw a series of O's in front of the garage door or wall and play Hit the Mark
from a designated spot, each person takes turns trying to hit each O with a tennis ball
When a player misses an O, it becomes the next persons turn