Lucky you! We took this trip this past September and it was fantastic! The diversity of the areas you will see is really great. A few tips which you can take or leave :-)
When in Reims...if you're able to find out what Champagne house you're going to visit ahead of time, maybe survey earlier travelers and see where they went? We toured Pommery on our own in the afternoon before our tour, and then went to Martel with our RS group. Very, very different experiences and we were so glad we had the two to compare.
If you happen to have good weather and are feeling like you could use a break, the hotel we were at in Vaison-la-Romaine had a pool and it was sublime (Hotel le Beffroi)! The only touring outing we had that we didn't love was visiting Orange and the Roman Theater there. It was a long drive with not an awesome pay off. Of course all this is super personal but if a bottle of wine, some reading by the pool is your style, that afternoon would be the one to play hooky ;-)
As a wine lover too, we were so excited that we were able to buy and ship wine home from the two wineries we visited in Colmar and outside Vaison.
Chamonix had an awesome drop off laundry place and for 13 euros we did a big basket full of our laundry. Yay!
Are you going anywhere before or after? So much to look forward to! Enjoy your trip and feel free to follow up if you have any questions!