Nice is not bad at all. I do hope you are going to rent a car as some places are just wonderful.
I would suggest you make a trip to St. Paul de Vence, Monaco but using the Corniche and when you see the observatory, all the way up, park and walk along the cliffs. You will have some of the most astonishing views of Monaco. A sheer drop of more than 1500 feet. Digne and Grasse a little further away inland are very nice as well as les Georges du Verdon. Wonderful for walking.