We'll most likely do a one week river cruise (Chalon-sur-Saône to Avignon), have six days in between that and one week in the Luberon (be based one week in Bonnieux (at Le Clos du Buis) doing local Luberon exploring (villages, historic areas, markets, etc.) Oh, in May 2012.

Ideally, we'd not rent a car, though for the six days it would be fine (Luberon we are covered, as we will be with a small group of 12 or so, two vehicles, etc.) We're considering some days in Aix en Provence, ending a couple of days in Avignon - but what may we be missing? Should we add Arles? (Etc.)

We have visited some of the coast (Nice to Monaco, and a little bit inland, hill towns, etc.) and wanted a more in depth time to experience Vaucluse, Luberon, etc.

We're well-traveled seniors, enjoy a moderate pace and like to walk, sightseeing, enjoying local meals, photography, etc. Your recommendations would be appreciated.