Ha! I'm just back after a week there, so will be writing up blogs and reviews for the next few days.
When you say take, what do you mean - clothes, money, other items?
First aid kit - include immodium and rehydrating salts. French pharmacies are few and far between and you won't be able to buy simple pankillers over the counter.
There's a shop and a sandwich place in the station (gare) - much cheaper for food than in teh Parcs. Also, a Esso garage and shop beside Hotel Santa Fe.
Take a corcksrew - french wine is lovely but they will insist on using corks.
Are you flying or Eurostarring?
Clothes - cropped trousers with button down pockets, a waterproof jacket that folds into your bag, an easy to carry day-bag, and comfy shoes (I'm not proud, I wear Crocs and fitflops when in theme parks)
Happy to answer any more specific queries.