My party and I have arranged to take a tour to Cinque Terre which leaves from Piazza Del Campo 69. We are not staying in Siena so we will travel from our villa in Montisi, using our rental car, to Siena to get the tour. Where is the nearest parking to Piazza Del Campo? Or should we just hire a car to pick us up in Montisi, deliver us to Siena and then return us back to Montisi after our tour?