well, some ideas :
Paris is beautiful around sunset (golden hours & blue hours), it's called "city of light" for a reason. And of course very crowded and full of pickpocket (maybe some kamikazes too)
Normandy : go straight to Mont St-Michel, worth a day or two shooting from many angles
Monaco : you can take a bus to go Nice-Cannes-Monaco for a few € and shoot the whole Côte d'Azur
Bordeaux : do not forget
Dune de Pilat, the highest dune in Europe, you have forest on one side and the ocean on the other side, it's absolutely a must on your list !
About the gear, I don't have the 645z so I have no idea, but if it was me, I might bring only 2 lens (love light weight gears), it might be a constraint but it will force you to see differently also (produce some photos people don't usually see)