I live at a place where my options for outdoor play structures is extremely limited, plus I'm renting, so this is the best solution I can do for an outdoor sandbox. I also live in an area where we get a lot of rain. So right now, this sandbox is actually a sandy wading pool. I've been contemplating how to allow the sandbox to drain water that enters it, possibly by drilling some holes somewhere along the bottom, but I'm uncertain exactly what to do. Obviously, I'd like to avoid draining out the sand as well or otherwise ruining the sandbox.
What is a good way to modify a plastic sandbox to allow the sandbox to drain water?