Repurposed our baby pool into a sandbox. You can buy play-sand at the hardware store for $3-5 per 50lb bag. Also read that adding a little cinnamon powder into the sand and pouring husband urine around sandbox keep cats away?
Found out Home Depot sells chalkboard ready to mount. 2 X 4 feet for $10. Added to our playhouse in the backyard. Leave that chalk mess outside!