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. Yusupov Palace, St. Isaac's Cathedral, and St. Petersburg Academy of Fine Arts are notable landmarks to explore if you're in the area. You can check out the local talent at Mariinsky Theatre, Bryantsev Youth Theatre, and Mikhailovsky Theatre.