I'm not sure about the cost, it's probably online somewhere. We weren't in Paris long enough to explore other tours, tho it looked like it would have been fun. Definiteyl would have saved us a lot of walking that night, it's amazing how far the eiffel tower is from the louvre when you aren't familiar with the streets. We stopped and asked directions a couple times and the people were surprised we were trying to walk that far. I guess it was a couple miles if you knew the direct paths.
