Having from from Marseille, Nice was literally a breath of fresh air. Beautiful beachfront city, clean and friendly. Everything within walking distance. Lots to see and do. Easy to take the bus or train to other local cities (e.g. Monaco, Cannes, Villefranche-sur-Mer). Beach was rocky but actually quite nice. Loved the old town.
Insider Tip:Take the bus or train to Cannes, the beaches there are much nicer. Enjoy some wood-oven pizza or freshly made pasta. Remember that gratuity is often included in your bill so if it says "prix nets" then you don't have to tip again. There are lots of shops selling the same souvenirs - shop around for the best prices. Visit the markets in the old town. Buy Marseille soap, lavender, Provence herbs. Enjoy the local wines.