Quiet in the Ardeche in August you have to be kidding.
I had a chuckle when I read that too
The French 'silly season' is 14th July to the 15th August, usually with a week either side being pretty busy too. 14th July is Bastille Day.
However, early season in the Ardeche is superb - if you can get away at the beginning of June then definitely go for it.
The last time we went was in 2005 -
Here - excellent camp site for tents, caravans or they have their own chalets. There's a nice Auberge across the river run by the people who own the camp site (try the caillettes and have a glass of jupiler and a few pastis for me please!) - seriously good value early season, the most expensive bit will likely be the channel crossing. The river separating the camp site from the village of Le Gua is La Beaume, which can be a trickle when there's been no rain and not the most 'canoeable' looking bit of water there is - when it's running at 'normal' levels, it's great for swimming, fishing and, I'd imagine, canoeing. It's also only a few hundred yards away. What you need in terms of authorization to canoe I don't know, fishing permits were available from the auberge.
The only drawback is it's a ways away from what modern man tends to regard as essentials - eg:
#Nearest Supermarket: Joyeuse, although Rosieres is a little larger 13kms to 15kms depending on which you choose.
#Best café: Café du Midi in Les Vans - although I couldn't tell you why, it's just a great place to sit and watch the world rush around from while drinking beer.
#Nearest fuel: Rosieres supermarket or a tiny garage in Lablachere approx 15kms
If you do go, the definitely visit the Musée de la Chataigne (Chestnut Museum) in Joyeuse - it's tiny and I honestly thought we'd have seen it in 30 minutes - but it was so interesting we were still there 2 hours later. The Bois de Paiolives is worth a wander around in too, it's an olive 'forest' planted in Roman times. Orgnac, grand site de France is well worth going to (take a jumper - it gets cold) as it makes Wookey Hole look a bit pale when it comes to cave deposits.