QR codes are everywhere, or so it seems. Most suffer from one or more of the 7 QR code mistakes that can kill your promotions. In Grand Rapids, Michigan, I saw one tourism campaign that actually avoids all those mistakes: The GR Tag Tour.
The signs are posted on existing sign posts, with enough text explanation to make it easy for visitors to figure out what they are for.
The QR code is scannable. An alternate URL is included for visitors who use mobile internet but not QR codes. The website that the QR code links to is mobile friendly, media-rich and actually interesting!