Oos, also called Oosbach, is a river of Baden-Württemberg, Germany. It starts in the northern part of the Black Forest mountains and flows through the town of Baden-Baden. The Lichtentaler Allee is the breathtakingly beautiful historic park alongside the west bank of the river Oos. The park has a 2.3 km long walking path along the river.
I was in Baden Baden for three nights. My hotel Leonardo (a 4 star hotel), was located close to one end of the Lichtentaler Allee. This was a good location as it took only a few minutes by foot to reach the park. It was the end of the spring season and the park was still full of spring blossoms. Navigating the park was easy - I just kept following the strolling avenue or the walking path that eventually led me to the city center with its various museums and the casino. Within the park is another historical park called the Goenneranlage - a rose garden with countless varieties of roses.
I was there on a weekend and the weather being bright and sunny, the park was very crowded. I also went there on the following Monday morning before catching my train to Bermersbach (another beautiful village in the Black Forest mountains), and found that the park was quite empty. I would recommend planning your trip during weekdays so there are fewer people and you can truly soak in the beauty of the park.
Also, read my post on Things to Do in Baden Baden, Germany: a Spa Town in the Black Forest Mountains.