When I was there last year I was intrigued by the UN compound on the other side of the Danube, and all the bleak post modern architecture around it - adjacent to that is a large park with a communications tower that folks bungee jump off, but also affords a remarkable view of the city (best light before midday). The park itself has a little train in it and other oddities (a sign proclaiming "golf kills!"). Have fun!!!