You might want to spend some time browsing the exhibits at Grand Maket Russia Interactive Museum, C-189 Submarine Museum, or Russian State Museum of the Arctic and Antarctic. Explore landmarks like St. Nicholas' Naval Cathedral, Saint Petersburg Conservatory, and Bryantsev Youth Theatre. You can watch performances at Mariinsky Theatre, Alexandrinsky Theatre, and Oktyabrskiy Big Concert Hall if you're interested in local theater.