We first went to Nimes in 1968 and were so impressed with the Roman remains in the town that we wanted to take our grown up son who studied Classics at University.
He was thrilled with the Roman temple - The Maison Carre - it has been steam cleaned and glowed in the glorious sunshine. The temple of Diana is a charming shady spot and the amphitheatre is very complete. Unfortunately the arena is tarmacked. Arles still has a sand arena. Fortunately Arles and Orange and Avignon are near enough to be covered from Nimes if you want to.
Nimes is a small but attractive town. All attractions can be visited by foot. It has a special old town atmosphere of charming buildings and great restaurants.
There is not much to offer in this city. I would not go back or recommend anyone to visit this city as there are many other cities more to offer in France.
Nimes is big enough to have all the extras you want from a place while small enough to allow you to really feel connected to it.
The historic attractions are easily accessible and first class. We found a good mix of dining options and plenty of retail options for healthy (or otherwise)self catering. Loved the Old Town area and relaxing at the cafes and restaurants. Could have stayed longer, the people were lovely.
This is a nice city, not too busy but has several Roman buildings of interest. The city felt safe at night in the center.
There are numerous very good small restaurants and in the area around Nimes there are many more historical things to see such as the Pont du Gare and Avignon.