Here's a great idea that has turned up on the internet: produce a QR code with your WiFi login information, print it out, and frame it. It will allow easy access to your WiFi for visitors, or in case your forget what you set it to. The idea was offered up by Redditor "thatshitischurchyo" and is something you could consider doing at home.
There are plenty of generators on the Internet that will create these QR codes for you, so I'll leave you to your own devices to locate one. I know this is something I'll be doing in my house!