We stayed at La Pergola in August 2011, it was a lovely campsite, very clean with great amenities, the children loved the pools and the lake. You can hire pedalos to dive off which was fun. You can walk beside the lake round to the other campsite which has more slides, I think it's called Domaine de Chalain.
We went to Geneva for the day, and there were quite a few daytrips more locally too. It was a great, relaxing holiday.
We're off on a Keycamp for the very first time this summer, and are trying to decide between Vendee, Dordogne, Loire Valley or Jura region. I love the look of Lac De Chalain in Jura, and being able to cross the border to Switzerland sounds like a fun day trip! I also love the look of Vendee and the Dordogne. Our children are 12, 9 and baby will be 8 months old when we go. Our main priority is nice, spacious, clean comfortable mobile home/bungalow/chalet with some privacy, lovely pools and watersides, and interesting local area, and sunshine. Any recommendations from seasoned KeyCampers?