Not really "can't miss", but I've done this walk/run a number of times, and it's quite gorgeous.
https://www.tripadvisor.com/Attracti...rovence_A.html
Not Cinque Terra or anything, but a nice little escape w/a very Mediterranean feel in the best parts. Statred @ the Monte Bay Carlo Hotel, though there's probably much better start points (i.e. East of the Roquebrune Cap Martin train station).