Runner, running in France

Both Lonodon and Paris are great for running and every time I go I see more runners. Both of them have great parks to run in. Heck there's even a running tour of Paris.

One of the challenges of running in Europe is that the streets and sidewalks are typically much narrower than in the US. That said, I have always had great running experiences in Europe. Paris has some great places: Tuileries and near the Louvre, Luxemburg gardens, and Champs du mars near the Eiffel Tower. I know that you said three miles/day, but depending on your hotel location, I would try to run to one of these green spaces. It was great running in the Jardins du Tuileries with no tourist lines and just a few other runners.

I know that I ran in Reims a couple of times, but cannot remember exactly where I went.
The place to run in Nice is along the water; there is a cycling/pedestrian lane that runs parallel with the sea. At 6 am, you will have no problem with traffic on your runs.

My impression in Paris is that you see relatively few people running in the street, but a lot in parks. Running in the street is rather more common in London.

Running on Hampstead Heath in London is nice because it's a huge area with many trails, some with fantastic views over the city. I also like Kensington Palace Gardens and Hyde Park - they're connected and have lots of paths for running.
In Paris running along the Seine, on the quay that is below street level, is really nice. Where the quay disappears there are stairs up to street level - you can run for miles!

Great advice, thank you! I will have to look into parks mentioned above.