When i lived in Nice, i liked contemplating the Port Lympia (also called “Port of Nice”). Gazing at the boats and the colorful buildings was always a pleasant moment. Besides, i used to go along the port to reach Quai des Etats-Unis so as to walk on the magnificent Promenade des Anglais.
Port Lympia is located : Quai du Commerce, Nice.
For more information : http://www.nice-tourism.com/en/port-of-nice.html