There are lots of fantastic sites around. In Millau itself (not under the bridge I hasten to add, which is a few kilometres up the valley) Les Rivages is good - nice grassy pitches, good restaurant, nice pool, clean facilities - and you can use ACSI after 1st September, which brings the cost down to 14 euros per night. There are loads of sites along the Tarn Gorge - from ultra small upwards. We stayed at Les Peupliers at Riviere sur Tarn (lovely bread, friendly site, quiet entertainment (quizzes, etc) and a medium sized site. Our friends stayed also at Les Peupliers (breakdown in communication) further up the Tarn in Peyrelade!!! That was lovely, too - smaller and quiet, but nicely shaded.