The Verdon Gorge located between Avignon & Nice is the largest canyon in Europe. The beautiful scenery can be viewed via a drive on the southern rim. Also there are opportunities for hiking & white-water rafting.
10 ways to live it up on the French Riviera - CNN.com
The Cours Saleya outdoor flower and food market operates in the heart of Old Nice Tuesdays through Sundays (Mondays give way to antiques). Colorful buildings, cafes and restaurants line the narrow square.