You might want to spend some time browsing the exhibits at C-189 Submarine Museum, Erarta Museum and Galleries of Contemporary Art, or Pushkin Flat-Museum. Saint Petersburg Conservatory, Yusupov Palace, and St. Nicholas' Naval Cathedral are notable landmarks to explore if you're in the area. You can check out the local talent at Mariinsky Theatre, Alexandrinsky Theatre, and Oktyabrskiy Big Concert Hall.