We’ve cruised the Med several times in the past six years and have done a mix of tours either private or ship arranged. For winery tours we’ve usually used ship’s tours as those are pretty straight forward and typically smaller groups. Might add Marseille is probably a good port fir winery tours as the city itself is not all that interesting. For historical or major sites of interest we use more private tours so as to not be included in huge bus loads. It helps we’ve done the Med all on smaller ships so even on the rare occasion where we’ve used a ship’s tour we’re not talking literally a cast of hundreds descending on a historical or major site.