Just a tip on Notre Dame...sometimes the line to get in the front door area will be all the way across the plaza BUT it moves really quickly. The hold up is security so just a quick peek in your purse and you're on your way.
This also is where the Roma petition girls will approach you and ask "do you speak English" then try to thrust a petition a clipboard into your stomach while talking. They will try to see if you've got anything unsecured in your purse or have you sign a bogus petition and then try to get money from you. Your best tactic is to not make eye contact or react if they say Do you speak English or if they get to close - hold up a hand and firmly say No.
I'm not saying this to worry you unduly. I'm saying this so you are ready when it happens and can watch in astonishment as others in the line get targeted! You will also have your valuables in your money belt under your clothes and only enough Euro in your purse for the day. You will also keep your purse in front of you and your hand holding the zipper and strap.
Your guide doubtless will also talk about security from pickpockets. I have no worries about personal safety other than pickpockets.
Do try out some of the creperies near your hotel! You ~may~ have a lunch stop on Day 7 in a Breton town where you can also have crepes for lunch so I'm certain you need some comparison, lol! My tour stopped in Fougeres but not sure if that is a call on the guide's part or not.
Also...make yourself keep at least a little bit of a journal. You'll be tired at night but take a small notebook or use an online program and at least jot down some impressions from the day for 5 minutes before you turn out the light. Try not to let yourself get behind on this! I usually write down my major stops, I keep track of my expenses (in general - not down to the penny but rounded to the Euro or pound), where I ate, sometimes what I had, anything memorable. You ~think~ you'll remember but you'll see so much you will forget some of it.
Also...type out or print out the name and full address of your hotel (including the 75014 zipcode type number). Tape that to a 3X5 card so you can just hand that to the taxi driver when you come in from the airport. With several of you it will be just as cheap to take a taxi which will have a base rate of 55€. At the airport you'll ignore anyone who comes up to you and asks if you want a taxi and you'll head to the line at the taxi rank. Ignore anyone who says the taxis to Paris are in a different place. Stand in line and the guy at the front of hte line will signal you to a taxi. They pull up 3 or 4 at a time and he'll point to the one he wants you to take. Will there be more than 4 of you? Official taxi is the easiest - do not book a shuttle especially a pre paid one. Just go with a taxi.
Siiigggghhh....now I want to take this tour again!