The questions are:
Daytrip?
Lugguage?

From Florence it is a ride with the train of roundabout 80 - 105 min. Oneway for roundabout 7 - 9 €. With the driver it would be more comfortable and also quicker on much higher costs. 100 + x € at least. The bus as an alternative has normally a stop inside the walls while you have to walk a little bit more from the trainstation to get inside the walls.