Depends what you want to pay and what level of service you require. If you just want to crash for the night (and Orange is a fair distance for travel off the tunnel) then Formule 1 is very cheap (and basic).

Try http://www.accorhotels.com They have a whole range of types of hotels from F1 right up to top of the range stuff.

As for thwe return journey perhaps Beaune or Trois on the way back giving you a manageable distance back to the Chunnel on the day.

Hi

We have driven down to Port Grimaud several times and usually use the Mappy site. They help you with Tolls/speed cameras/hotels etc, we always use it now for journeys in France.

http://www.mappy.com/

Campanile hotels are great for families, nice little restaurant & bar attached and sometimes a play area for the children

https://www.envergure.fr/campanilefr.html

Smiles
Cath