“My wife and I both read your book and thoroughly enjoyed it. Shortly after reading the book we were on a bicycling tour through southwest AZ and spotted your adopt a highway sign. We should have taken a picture. We use a company called Cycling Escapes and the owner has offerred to snap a photo for us but we couldn't narrow down the stretch of road.”
I don’t live in Southwest Arizona and don’t have an adopt a highway sign anywhere, but no matter. An unexpected note like this makes writing worthwhile.