Josic Wine Cellar is 1.3 mi (2.1 km) from central Osijek, why not stop by during your stay. If you'd also like to explore some of the parks in Osijek, Park za pse Bobi is nearby.
If museums are on your list of things to see in Vukovar, then you might want to head to Vučedol Culture Museum. If you want to see more of the museums in Vukovar, Vukovar War Memorial isn't far either.
If you're planning a bit of sightseeing during your trip, head to Osijek Citadel— just one of the landmarks located 0.4 mi (0.6 km) from central Osijek.