The ruin on the hill that can be seen on the skyline from the apartment is well worth a visit - if only for a sensational view back over the castle and surrounding estates.
The Coop in Bucine has pretty much everything you could need for eating in - and plug-in insect deterrents which are essential if you are susceptible to being bitten.
The train to Florence is a must - handy from Bucine, and takes just over an hour, and all for less than it would cost for parking.