What cultural faux pas should I try to avoid making in French Riviera?

"When visiting the French Riviera, avoid speaking loudly or being overly boisterous in public, as the French tend to value discretion and politeness. Make an effort to learn and use basic French phrases, as locals appreciate when visitors attempt to speak their language. Do not expect shops and restaurants to be open all day, as many businesses close for a few hours in the afternoon. Dress appropriately, especially when visiting religious sites or upscale establishments, as the French take pride in their appearance. Avoid discussing personal finances or asking about someone's income, as this is considered impolite. When dining out, do not ask for substitutions or changes to the menu, as this can be seen as disrespectful to the chef. Finally, always greet people with a polite "Bonjour" or "Bonsoir" and say "Au revoir" when leaving, as this is an important part of French etiquette," remarked another expat who made the move to French Riviera, France.