It's best if you provide a bit more detail about the sort of sites you like.
There is a lot of difference between sites on the busy coastal strip and sites a bit more inland. Then there is the rivers of the Ardeche, Verdon or Tarn/Dourbie/Jonte gorges. Then there is large, medium or small sites with the larger ones being busier and noisier...
------------- Ollie
2016
Monplaisir - Provence
Camping Les Gorges du Loup
Hi, can I suggest Les Genets d'Or in the same general area. We have just got back from there and I have not had time to do a review. The site is not on here, but was recommended to me by another poster. Our children are 15, 13 and 11 and said it is the best holiday we have had. There is a heated pool, no slides, but you have direct access to the river where you can swim, boat and fish. All the facilities were very clean. Not as many facilities as Claydoncamper's recommendation, but not as expensive, either. There is lots to see within a half-hour drive, such as Avignon, the Pont du Gard and Roque sur Ceze. The coast is within about an hour (maybe less), but we didn't visit as we were perfectly happy around the site.
We were the only English people there, but that didn't matter as most of the others were Dutch and speak fantastic English. My sons (15 and 11) made friends that will be keeping in contact with. There was late-night swimming (mostly for the 10-18 year olds) from 9.30 to 11 three times a week. Also, FREE wi-fi.
Sorry, can't help with the getting there by train as we always drive.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets