Visit France for the better weather, the great wines and lovely cheeses. They can go to Disneyland Paris (a theme park unlike any British one), visit the Eiffel Tower, the Louvre, the Champs Elysee etc. They can walk along the Seine, go to the Moulin Rouge. Or just camp in the summer months.
For the relaxed armosphere and lovely rural cooking if you're talking Northern France or the glamour, hot weather, beaches and Italian style food/seafood in the South.