On this trip I visited San Gimignano on both the Globus and Insight tours. With the Globus tour we visited around lunchtime on a Thursday, which appears to be market day and unfortunately we had light rain. Whereas for the Insight tour we visited early on a Sunday beating the crowds and we had good weather.
To see pictures from my 2011 trip to San Gimignano, follow this (link)
or click (here) for a map of San Gimignano.