Neither of us was familiar with the name of the type of fish he chose. It came in a dill sauce with risotto and he was quite happy with it. I ordered only a main dish and it was delicious - risotto with scallops.
Bill chose crème brûlée for dessert and generously shared it with me.
Now here's the disappointing part. I had misread a map and thought that Cezanne's studio was within walking distance of the town center. However, it's north of the town and requires a shuttle bus ride and possibly reservations. If we were going to get back to Avignon at a reasonable hour we really didn't have time to visit the studio since the bus ride to Avignon takes an hour and a half. So instead, we did part of the Cezanne walking tour, including a visit to the art museum which has several of his paintings. We saw the house where he was born (unimpressive) and the cafe where he hung out with friends.
Here's what they call the mossy fountain in Aix.