We will be traveling to southern France on our honeymoon 9/8-9/19. Our itinerary so far is:

Fly in to Nice - 9/9
Nice 9/9-9/11 - Hyatt Nice
Cannes 9/11-9/13 - Hyatt Cannes
Marseilles 9/13-9/16 - Radisson Blu
Avignon 9/16-9/18 - B&B in the city
Lyon 9/19 - Hotel near train station
Fly out of Lyon 9/20

Our only plans so far are:
-Day trip to Monaco 9/10
-Guided wine tour around Provence 9/17

We're looking for the must see and must taste recommendations. We won't have a rental car, and will be doing our traveling almost entirely by train/bus - although if there is something that's worth a drive, we're open to getting one for the day.