Of the six itineraries featured in this app, three cover Nice itself: The Old Nice Walking Tour is the core choice, while Nice In-A-Day covers The Modern Centre. These two can easily be combined if you wish.
A third itinerary, Outer Nice, covers points of interest outside the centre for which you may require some form of transport.
If you want to get up into the mountains there are two itineraries into the Mercantour, one exploring the Roya and the other exploring the Vésubie. (The Vésubie Route is only available in my Provence's Best App). These are the two main routes into the 'Beyond' as the locals call it.
You will notice that one of the main features of the area is the Baroque architecture evident in many towns and villages, so there is an itinerary featuring the Route du Baroque which you will see signposted.
since Nice is the capital of the Riviera I have written an appropriate itinerary - A Drive from Nice to Menton. A further itinerary covering the Coast from Nice to St-Tropez will follow later.