How do you say have a lovely time in France French?

There are a few ways to say "have a lovely time in France" in French, depending on the formality and context:

Formal:

* Passez un agréable séjour en France. (This is the most formal option)

Informal:

* Bon séjour en France! (This is a more casual way to say it)

* Profitez bien de votre séjour en France! (This means "Enjoy your stay in France!")

* Amusez-vous bien en France! (This means "Have fun in France!")

Other options:

* J'espère que vous passerez un bon moment en France. (I hope you have a good time in France.)

* Je vous souhaite un excellent séjour en France. (I wish you an excellent stay in France.)

You can choose the phrase that best fits the situation and your relationship with the person you are talking to.