Well....I just put it into google maps from Florence and its at least 3 modes or transportation, a bus, a train, and a bus and then a walk that would take 3 hours and 40 min or so (and from Bologna airport, same, bus, train, bus and about a 10 min walk for 3 hours).....not my cup of tea if I were to land sleep deprived in Italy.....if you are DEAD SET against renting a car, I would possibly take the bus/train to a generally larger town nearby and plan on meeting a driver to drive you there (though from Berzantina, where the bus departs from on the Bologna trip, its still 30 min away by car) to get you the more challenging part. Can you ask the resort owners what they suggest? They maybe would have a driver to recommend or other ideas. That's not something I would want to take on myself.