A very beautiful park for walking on the banks of the Danube in the old part of Belgrade. Nearby is the ancient fortress of the same name with many wonderful museums. I've been here a few times. Which I wish you too).
Convenient location to the center, beautiful view from the height of the Sava and the Danube, however, if you want to buy something on the territory of the fortress, be prepared to pay three times more expensive than in the city