Unlike Ada (check the Ada article), Great War Island really is an ada, a river island. Right across Kalemegdan, approachable from the quay of Zemun, to the municipality of which it belongs, the island is a preserved resort of numerous plant and bird species and, as of 2002 a natural fish spawning area. Low, marshy and often flooded by the Danube, the place is uninhabited and officially declared uninhabitable: it is practically the only part of the City of Belgrade where building touristic facilities is not allowed.
So, there’s no way you could be accommodated there, but there’s still a way to enjoy the nature. The northern tip of the island is a beach, known as Lido, and can be visited from early spring till mid-September. During this time a pontoon bridge connects it to the Zemun quay, or you can take one of the small boats there for a small fee. They are anchored right across the island, they are not easily detectable but you can see the signs.
As it is not allowed to build on the island, it is pretty wild, but a sandy beach, an improvised beach volleyball court and lots of shade, provide for a peaceful day by the water and a lovely view of Gardoš Tower. In winter, the bridge is not there but the boats still are.