I used to use a tarp stuck down with tent stakes but, well, you can see what happened. Every time I watered the lawn I got a mosquito breeding puddle that started to grow slime and when the wind blew the tarp wouldn't stay down and blew all over. Here is my solution: I used a piece of shade fabric and stapled it to the sandbox on one side with a staple gun. On the other side I sewed a pocket and slid a piece of PVC pipe in it and put end caps on. I bolted some tarp hooks to the side of the…