Bruce Lee is probably the most famous martial artist of modern times, and he was known to be very dedicated to his training. Between his martial arts training, his movie career, and his family, Bruce likely didn't have much free time for other kinds of recreation.
Did Bruce ever mention, however, whether or not he enjoyed reading wuxia novels? It'd be a trip if it were to be revealed that Jeet Kune Do was inspired by something such as Dook Goo 9 Swords, whose philosophical underpinnings seemed similar to Jeet Kune Do's.