Well, north of Antibes you have indeed 10km of a sandy beach, not interesting at all, and pretty crowded, so you can forget about that part. However, that's probably the longest sandy beach in that region. Then you have the bay of Cannes that is just an uninteresting crowded beach. More interesting is the peninsula south of Antibes, all those diverse islands (the one in front of Cannes, the Porquerolles,...), the Presque'ille de Giens, the Calanques,... - there are plenty of really beautiful places with some excellent diving. Some of them are difficult to access, so they are really quiet even in the highest season and despite being very close to big city like Marseilles.
I know only one camping in Antibes - although huge, it was very nice, quiet, with a lot of room for each placement, and in a walking distance to the beach. However, I saw it in May, so in the high season it is certainly a bit less quiet anyway. Unfortunately I do not remember the name.
However, you should be aware that campings are pretty expensive in France. Personally I rarely use them - if you can plan your holidays, it is often not much more expensive, but much more quiet and more comfortable renting a private house or an apartment - you can find most offers at
Site officiel Gîtes de France®. 55 000 offres locations vacances en France.
Be sure to use Google Maps - set it into the satellite mode, turn on the photos, webcams, and videos, or turn to the Street View, and check out the places you are interested in. Some of them look beautiful on the photos of the advertisement, but if you look at them in Google Maps you get a much better idea.
If you want to be quiet, you may need to go more inlands, but then again you will be stucked in the daily jams each day going to the sea and going back. Using bicycles may be difficult and dangerous, but the situation improves and some bicycle tracks slowly appear everywhere in France too.
If you go for 2 weeks, I'd recommend booking some 3-5 places along the coast and exploring it all. It is really woth of it. You should not miss the diving with CIPA (Nèry) in Nice, diving with Mifsud in Hyères, you could dive with Frolla in Monaco, and you should definitely stay a few days in Marseille for diving in the surroundings (you must see the Calanques, when nothing else, but there is enough to explore for many weeks there). Your wife can make some shopping or culture in the mean time
And on the way there or back, you should stop in Geneve and dive with
Christian Maldamé in the lake of Geneve - he is a great pedagogue, and the diving is excellent there too.
I am just afraid that it may be a bit late for booking - a lot of places will be already taken by now, unless you can go out of the main season (june, or september). Also be ready for crowds of tourists and traffic jams during the main season.
