First time overseas with the caravan; Off to Paris

We are quite new to caravanning, only getting our outfit in the summer of last year.

This August we want to go to France, near Paris as we want to go to Euro Disney (Sky Offer).

I have looed on the CC website for a site near Paris and they seem to only have one listed.  Am I doing something wrong?

Is it best to book everything through the club?

Kind regards

Triban