My group of six had a great tour of Mont St Michel and St Malo. The tour guide was very nice and knowledgeable about the sites. We were picked up at our chateau on time and it met all our expectations. It was first class and I would recommend it to anyone.
My wife and I took the Versailles bike tour with four friends and had a great day. We got to see parts of the grounds that we would never have seen by foot. The whole tour was a unique experience -- buying our food at a market and having a picnic on the Versailles grounds. Well worth the cost.