We booked a private Amazing Race tour with Blue Fox with our three and eight year old girls, and my 70-something parents. My eldest daughter loves Amazing Race so we knew this would be really fun for her. Of course a private tour is definitely more expensive than joining a group tour, but if you have some novice riders who aren't 100% comfortable on a bike and/or in new surroundings (my mom!), then it is worth it. Our guide Robin was excellent. She was so patient and enthusiastic, despite some crankiness and the extreme heat. We were able to see so much of Paris...though still hot and sweaty on that day, much better from the back of a bike than walking. We learned some cool facts that my daughter still remembers and laughs about, and did some fun challenges along the way. Bikes are very comfortable, though water bottle holders would have been nice, especially in the heat. Our older daughter had her own bike and the younger one had a bike seat.
Great experience!!