Tourism Office
There is more than one Office that provides information about Lucca. The main one is in Piazza Santa Maria and it is opened every day between 9 am and 7pm (April till September).
There are some audio guides that may be rented for a tour of Lucca. I came across some visitors using this kind of "phone" at main must sees, such as the Duomo. But I didn't rent any, so I cannot account to their "effectiveness". I am not much of a fan of audio guides, so I didn't get any further info about using or renting them.


Statue of Puccini with his birthplace on the right
Tower Guinigi.
More inscriptions....
Interior of San frediano