Yes, the campsite is close to Sete. Sete is 20 minutes by car from the campsite. But it is also possible to go there by boat!
A shuttle linking Sete to Meze via the Etang de Thau is in place in high season, until November. The trip takes about 40 minutes. The ticket costs 3 euros per unit, 5 euros for the round trip, 20 euros for the 10-trip ticket and 35 euros for the 6-month subscription.