What was a great idea that turned out to be not so great?

Mine was the idea to walk to Ventemiglia in Italy from Menton in France, to see the famous market there.
We had an old book and Ventemiglia looked to be just over the border from Menton, a couple of miles tops.
I should have remembered that maps in old books aren't always to scale.
Menton is 11.5 kilomenters from Ventemiglia, (7 and a bit miles).
Not a bad walk I suppose but my friend and I were the only two doing it on a hot summers day.
Anyway, we eventually got to Ventemiglia. To find out that it wasn't market day..
We came back on the train!
We had an old book and Ventemiglia looked to be just over the border from Menton, a couple of miles tops.
I should have remembered that maps in old books aren't always to scale.
Menton is 11.5 kilomenters from Ventemiglia, (7 and a bit miles).
Not a bad walk I suppose but my friend and I were the only two doing it on a hot summers day.
Anyway, we eventually got to Ventemiglia. To find out that it wasn't market day..



We came back on the train!