Nice is a good place to visit the French Riviera. You can do so by car, by renting a car on the spot or even a scooter, going by train or by bus.
The Pastorelle has a direct bus to the railstation stop. You can go to Cannes, Antibes, Saint Raphael, Ventimiglia (Italy) or in Monaco.
Bus lines are available on the Promenade des Anglais to go to Antibes, Cannes, fat, Saint Paul de Vence.
From the port of Nice, you can organize trips at sea of about an hour to see the Riviera otherwise. You can also do mini cruises to the islands of Lérins (in front of Cannes), to Monaco to St. Tropez.