First time caravanning abroad

Well this time next week we will be in France!! eek

We are a little apprehensive, to say the least, but excited too.  The only thing we have left to get are the breathalysers, our local Halfords has sold out, so hopefully we will be able to get them on the ferry. 

We would like to get Nantes, as we have been told there is good cycle paths there.  Would like any recommendations for sites - we will be using the ACSI card.