You might want to spend some time browsing the exhibits at B-413 Submarine Museum, Bunker Museum, or Kaliningrad Regional Museum of History and Arts. Sights like Ruins of Koenigsberg castle, Brandenburg Gate, and Honey Bridge are must-sees while exploring the area. You can catch a show at Queen Louise Kirsch Puppet Theater, Kaliningrad Regional Musical Theatre, and Music theatre on Basseynaya.