Apart from the many nice places to visit from here the city itself is worth a visit. Just around the harbour or if you like to venture a bit further into the city everything is nice. And in the south you find some secluded beaches with interesting rock formations. If the weather permits leave the yacht and take the dinghy along the coast direction SE for a mile or so. These places give you an idea what the Calanques are like.
France, La Ciotat