The Paris Marathon was a really nice race that passed many of the big sights. I had feared the route because of the hills, but luckily, it went much better than expected. A bit of an incline up to around 17 km, but then mostly downhill around 37 km - and then it was just about getting through the last 5 km. However, it's worth noting that there was a lack of toilets in the starting area. But all in all, it was a fantastic experience to run in Paris.