|Subject: Provence and Camargue|
I would suggest you make your base in a smaller town, such as St-Rémy-de-Provence. Parking there is so much easier and safer. St. Rémy lies in between Arles and Avignon, very close to Les Baux-de-Provence, the Roman site Glanum, and the asylum where van Gogh spent almost a year. Also the Luberon (Peter Mayle country) is less than an hour away.
The guidebook Hello France! lists a number of attractive and inexpensive hotels in St.Remy. I can't vouch for any of them, because I always go home to my own bed.
The Camargue is a delta area, very interesting for nature lovers, flamingo spotters, horseback riders, and hikers. Because it's so protected, there are few roads. Driving through, you will not be impressed by the flat, rather dull landscape. In order to enjoy it, you need to go for a long walk or rent a horse. I'm not sure whether I would give up one of the four days for the Camargue.
Hope this helps, Frieda http://www.aboutprovence.com