Nice has been French for good only since 1860. For most of the five hundred years before that, apart from a spell under the Revolution and Napoleon, it belonged to the Dukes of Savoy and the Kings of Sardinia, and you can still hear it in the names on the street signs, which come in French and in Niçard, and taste it in a cuisine closer to Genoa than to Paris. Then, in the 19th century, the English and the Russians discovered its winters, built palaces and a seafront promenade, and turned a small Italian port into the capital of the Riviera. In 2021 UNESCO listed it as a "winter resort town".
It's France's fifth-largest city and it has a real life of its own, not just a seafront. The old town is a maze of Baroque churches and laundry lines, the markets are among the best in the country, and the light that drew Matisse and Chagall is still there every morning. Five days is the right amount because Nice is also the best base on the coast: Villefranche, Èze and Monaco are all within half an hour.
Day one is the old town and Castle Hill, day two the hill of Cimiez with Matisse and Chagall, day three the coastal path to Villefranche and Cap Ferrat, day four Èze and Monaco, and day five the Belle Époque seafront and the beach. Museums and markets close on different days, and the plan fits best if day one falls on a Wednesday. More trips, from Saint-Paul-de-Vence to the Train des Pignes, come after day five. For the bigger picture, see our page on France.