Truffle Hunting next September
September is likely too early for white truffles. Late October/early November is when the season begins. There is some truffle hunting done near village of San Giovanni d'Asso, which is south of Sienna. There is a small truffle "museum" in the town. There was a NY Times article written about the town 5-7 years ago. You can probably find it at www.nytimes.com.