Bring your scuba diving gear when visiting Marseille, Cassis, and any beach heading towards St. Tropez! There are a plethora of beautiful beaches from the border of Spain all the way to Italy.
Drive the entire coastline of Southern France. You will be very happy you drove here like the locals. Shop and eat where the locals hang out, too. Blend in by wearing no designer brands, no USA T-Shirts/tennis shoes, just wear nice, non-descriptive, casual clothes.
Carry a small video camera which also does double duty taking still shots. Go hiking along the shoreline and absorb the breath-taking vistas.
Stay at hostels driving from Spain all the way to Italy. Go visit these URLs:
I hope to see you somewhere around the planet!