Easy enough to find an airfield to park at in France. Some will charge you for the privilege but there is sure to be some microlight friendly place that is cheap or free. Usually you don't need to book but ymmv.
Some larger airfields don't like microlights but plenty accept them.
There are complications in taking aircraft without a full certificate of airworthiness abroad but there is usually a way and I think France is extra simple anyway. I'm sure someone else here will be along soon to give chapter and verse.
Don't expect a microlight to be an ultra reliable way of getting to France .... often the weather will be ok - but not every day!
Good luck and welcome to aviation!