The biggest clubbing area is next to the Drava, namely Trvda. You can find the best bars and clubs here, and you would not be disappointed. I recommend that you go to Epic Alternativni Klub and Club Tufna where you can get drunk and enjoy the best nights in Osijek with the best local music.
If you are a foodie, you can go to Slavonska Kuća where you can enjoy the traditional Slavonian food. They offer a daily menu which means you will have the freshest food of the day. I tried the fish soup with a mix of vegetables and grilled meat, and they were superbly good.
If you just wish to walk along the Drava, I recommend you walk there at 8:30 pm when the sun is slowly setting so you can catch great shots of the Pedestrian Bridge and the Cathedral of Osijek.
Still not felling satisfied?
I recommend the pub Merlon where you can buy fast food and enjoy alcoholic drinks !