Has anyone taken one of the group bus tours offered through the Aix en Provence Tourist Office? I am not a big fan of organized tours, but these look like they might offer the easiest way for us to see some of the villages and markets in Luberon without having to rent a car. I don't have a sense of how many people they accommodate (the smaller the better for us), but there is a wide range of tours offered for a reasonable price. Any input would be so helpful. Thanks.