My trips to France range from daytrips across the Channel to the likes of Calais and Boulogne; short "mini-breaks" to Northern France, such as Le Harve and Rouen and longer holidays to Paris, Reims and further south to Beaunne. I also have the South of France, Nice and the Provence, on my list of places to revisit before long.
Having enjoyed reading Alain Fournier's "Le Grand Meulnes", I have this picture of a rural France with small villages dotted around the countryside, connected only by small D roads. You can very quickly experience this side of France by coming off the main Autoroutes almost anywhere.
Paris is well worth a visit for either a weekend or a longer break. Once you've done the must-do visits to the Eiffel Tower, River Seine cruise, Notre Dame, Sacré Coeur and perhaps a stroll along the Champs Elysée there are the Catacombs, Moulin Rouge and lots more. The cities of Rouen and Reims also provide plenty to see and do for short breaks. Reims is of course the place to visit to tour some of the champagne houses.