DIY: A Simple Sandbox on Wheels Tutorial from The Nonchantdad (Karim Hamid). Sandbox was featured in an issue of Domino magazine. *May want to create cover to keep sand clean from the elements & neighborhood cats.
I just found a canoe at the lake with a hole in it and drug it into my yard! Upcycle an old boat/canoe into a sand box. Abram would be wild about this! You could even make a sail out of tarp that can also double as the sandbox cover.