Considering that kids are hardwired to love wallowing, rolling and sometimes even dining on sand, you can’t really build a bad sandbox. But it turns out that a pretty solid one is plenty easy, too, and can be done for under $200. All you need is a bunch of 4x4s, timber screws, some landscaping fabric and a relatively flat piece of yard. Sand also helps. If you want to get really fancy, tarp cut to measure and secured with high test Velcro tape can serve as a lid and ensure your kid isn’t playing around in the neighborhood cat bath house. Once you’re done, here’s everything you need to know about sandcastles.