We stayed in the Latin Quarter. It wasn't too touristy with a nice variety of restaurants and fairly easy access to the metro and walking distance to Île de la Cité. The metro system criss-crosses around so we got the tourist Viste passes to ride as much as we wanted. We took many short trips when we needed to cut down on walking between sites. We didn't bother with Hop-On-Hop-Off buses for Paris because of reviews saying traffic bogs down the buses. The metro and RER commuter trains were a great way to get around to what we wanted to see. The nice thing about the Viste pass was hopping on the commuter train for just one stop if we wanted.
It was rainy every day except for the last beautiful day. We saved the Eiffel Tower and Arc de Triomphe for last considering the weather. We had nice long leisurely lunches and dinners every day since Paris is a city for dining with multiple courses. We had some time on our travel day so we started at the Père Lachaise Cemetery and Jim Morrison's grave because it was neat place to be. These are all better photos from our daughter's camera instead of the the cell phone pics I posted on Facebook.
We saw the outside of Moulin Rouge just for grins. It was pricey to attend so we opted out of that tourist experience.
Île de la Cité has Conciergerie prison, Louis IX's Sainte-Chapelle, and Notre Dame. Here's some pictures:
We visited the outside of the Louvre and nearby parks on a dreary day with a little drizzle. Instead of braving the really long line to go inside we spent time with gourmet hot chocolate and delicious desserts at Angelina. We did go to the Monet museum and saw the quarter sized Lady Liberty on the way out there.
Our final day was a good one with beautiful weather for walking around the Eiffel Tower and Arc de Triomphe. Some people (not me!) were a little too tired to try climbing anything so we stayed at ground level for it all but it was all plenty impressive from that vantage point. I was going to go up the Arc without them but I didn't want to leave them all alone and waiting. :-)
We also saw the Panthéon before we left since it was just a few blocks from our hotel. We almost forgot it was there since it was one of those we'll see it later things. It had a model of itself inside which was funny to me... probably because I looked to see if there was a model of the model inside the model. There wasn't. :-(