If you want to do side-by-side reading, you can get most of Shakespeare in bilingual editions on Amazon Fr. In fiction, I recommend Poe's "Histoires extraordinaires" and "Nouvelles histoires extraordinaires" (Baudelaire translated those to French).

From French authors, Barjavel is one of my favorites, and is considered as the grandfather of French sci-fi. "Le voyageur imprudent" and "Ravages" are good examples of it. He also wrote "L'enchanteur", which is a nice rendition of the Arthurian myth, centered around Merlin.