You might want to spend some time browsing the exhibits at Kaliningrad Regional Museum of History and Arts, B-413 Submarine Museum, or Amber Museum. Sights like Ruins of Koenigsberg castle, Timber Bridge, and King's Gate are must-sees while exploring the area. You can check out the local talent at Kaliningrad Regional Philharmonic Hall, Art House Concert and Theater Complex, and Kaliningrad Regional Youth Theater for Young Spectators.