You'll want to browse the collections at Museum of the World Ocean, Bunker Museum, and Amber Museum. Ruins of Koenigsberg castle, Timber Bridge, and King's Gate are monuments to see when you're exploring the area around Park of Sculpture. You can watch performances at Kaliningrad Regional Drama Theatre, Kaliningrad Regional Philharmonic Hall, and Kaliningrad Regional Youth Theater for Young Spectators if you're interested in local theater.