Well basically almost any site is bay friendly: however a few really stand out.
About 15k out of Carcassonne is Moulin St- Annehttp://www.moulindesainteanne.com/gb.html Nice pitches small village a really good facilities
West of San sebastion in Spain possibly the site with the best views in europe Gran Camping Zarautahttp://www.grancampingzarautz.com/index_en.html. Loads of buses on this site as it is a bit of a surf haven
Almost any Croatian site is good but expensive and usually crowded
For the friendliest service you have to go into the pyrennee South of Pau in the Ossau Valley is the small site of Camping le Reyhttp://www.camping-pyrenees-ossau.com/en/index.html. It may be small but it is a great site and great access if you want to explore some of the best cols of the Tour de France
Daphne at Camping Le Rey 2008