My husband and I are going to be spending a week in a villa in Tuscany this May. We plan to spend our time driving around the hill towns and visiting vineyards and olive groves to taste the wine and the oil. How easy is this to do on your own without a tour? We don't want to have too structured of a trip, but it seems that many places are not generally open to the public and that you must call ahead to make an appointment. Is that the case? If so, how far in advance should we do this? Can we wait until the day of or the day before? Thanks in advance.