Turn your driveway into a fun target game using chalk and sponges.

Materials
Sidewalk chalk
Wet sponges

Directions
Draw four large circles on a flat cement surface (most likely a driveway).
Label the circles by points (10 being the outer ring and 50 in the center).
Wet sponges and take turns throwing them at the rings.

Source: http://news.distractify.com/culture/less-than-10-kids/?v=1
Check out the other 65 Days of Summer Fun ideas here.