We had just returned from a cruise around New Zealand and to Australia when you wrote, so this is the first time I have logged on to Cruise Critic in awhile. If you haven't found out the information by now, the Windstar 6 hour Mont St. Michel excursion costs $235 per person. By road, it takes 45-60 minutes to drive there, so the actual time at Mont St. Michel will likely be about 3.5 hours. We decided to take the ship's excursion because we can be assured that we will get back to the ship on time.