Hi Rosemary, I'm not on your tour but this was the first RS tour I did in 2007. I traveled solo and had a wonderful time. Paris is a fantastic city and you will see all the highlights. I loved the museums and all the sites included on this tour. Great food, great group of people. Our tour guide was wonderful and helped us figure out what to do in our (limited) free time.
The Eiffel Tower is not included on the tour so you might want to do that one afternoon or evening. A (1 hour) Seine boat ride is also a very nice idea.
I've found that the city tours attract more single people so you will be in good company. Hope you have a great time!