Stores, banks, post offices and businesses are closed on the following French national holidays:
Boulangeries and flower shops are usually open the morning of national holidays but other stores are closed or close early. It's wise to avoid travel if possible on a national holiday. The airports are a mess, roads are clogged, train stations are crowded. Be aware that on May 1 there's no public transport. Try not to arrive or leave that day as taxis and Ubers will also be booked out.
For warm weather holidays, everyone heads to the coast. Winter holidays sees everyone grabbing their skis and heading to the slopes.
And it's not just the holiday itself to beware! French people love to faire le pont or "make the bridge" which means that shops, restaurants and business will be closed on Monday if the holiday falls on Tuesday or Thursday if the holiday falls on on Friday. Some think: "The heck with it. Let's just take the whole week off!"
Hi! I'm Jeanne Oliver--tour guide and author and I've been living on the Riviera for years. With my local insights your trip will be easy and fun. And, do check out my book Nice Uncovered: Walks Through the Secret Heart of a Historic City.