We took all 4 of the kids here & sailed from Poole to Cherbourg, there & back. We did not get a berth on the boat just club class seats. This left little recovery time for me the driver as we had a disturbed nights rest (thanks to Joshua not settling at all!).
It took us just over 4 hours to drive from the port at Cherbourg to the campsite at Carnac via Rennes & was about 230 miles.
We opted for a fairly basic 2 bed caravan. This meant that the 3 lads slept in the same room (1 single bed & 1 bunk bed), Sam slept in the pull-out double bed in the dining space while Michele & I had the double bedroom. The boys were a little cramped & we had to set up the pull-out bed every night for Sam but we managed.
The campsite was well laid out & had a great pool complex.
The weather was OK in August but we would have preferred it to have been warmer, we had a few days of rain but again we coped.