Starting from Carrara http://www.turismomassacarrara.it/en/default.aspx you have the opportunity to do 15 km until Campocecina, under Mone Sangro, the starting point for a host of excursions. To go to Colonnata (a small village famous for its bacon), you will cross again Carrara, entering the heart of the ancient marble quarries. After Mass, waiting for the appointment with the Passo del Dress (with abandoned caves of Henraux), but soon after, entering the valley Turrite Secca, meet the Potholes (rocks carved by water), then you’ll see Holy Island , reaching Castelnuovo of Garfagnana. http://www.turismo.garfagnana.eu/en/visitare/Castelnuovo-di-Garfagnana.html In this ancient town, famous for hosting Ludovico Ariosto, you can choose the best trip for your needs, even skiing at Abetone.
On the way back, from Barga (small fortified city, with streets paved in stone), ascend to the lonely Hermitage of Calomini, but the event more exciting about your experience in the Apuan Alps, it will be Fornovolasco, to see the famous Wind Cave, in which you can choose your favorite route guidance. 100 km and two days, with a stop in Castelnuovo Garfagnana (where you can access the welcome center visitors), are the synthesis of this corner of Central Italy: the tour of the Apuan Alps. http://www.grottadelvento.com/ENG/home.aspx