We are going on Emerald Princess on May 12 and so far have only booked a tour for Ephesus. I think since there is not much to choose from in Mykonos we are going to wander on our own and in Marseille I think the best places to visit are Aix en Provence, Arles, or Cassis. I am thinking by then we will be tired of churches and ruins and may choose to do the tour to Cassis--a small fishing village--to enjoy the view and some vin. Marseille is a bit of a rough place( memory of some 25 years ago!) and I think there are better places to see in Provence.