Monaco is a very safe, crime-free location, with a strong police presence. Every public space is blanketed with cameras and any kind of disorder may produce an immediate reaction and the attendance of many officers.
respect
In many ways, the Respect section of the France page can detail how to be respectful toward the Monegasque population, but it should be noted that Monaco is a separate nation and it would be very insulting to casually conflate the two. Keep in mind that Monaco's population retain their own history, their own culture, and their own lifestyle. With that in mind, everyone is approachable, happy to chat with you and globally simply kind. Directions or other help are only a smile and a question away.
talk
Languages: French official and Monegasque.