I was told about a bike trail that goes all around the city, along Sava and Danube. But they didn't tell me that, right under Kalemagdan fortress, it goes under the water. Interesting park design. Actually this place is exactly where the house boat [the Summer Palace] is at http://europelostandfound.net/node/530, but here its all under water. The house boat will be right behind the tree in the water.
Pic by Kyong, July 2006