Sorry, not an answer. I've booked onto this cruise as well, so i'm also curious about this venue.
There are lots of beautiful beaches around the area but at this time of year only good for walking along but there are some great walks here. There are oyster and fruit de mer cafes and restaurants all over the area. If it is still running then there is a ferry to Royan which is a very pleasant town on the Cote Sauvage or for an extremely pleasant day rent a car and go down to Bordeaux. You can also tour the vineyards of the Medoc but I would advise the driver to stay off le vin. Right time of year for the wines but wrong for so much of the other things the area is noted for. Bon Chance. ..... Neil.