You might want to spend some time browsing the exhibits at Erarta Museum and Galleries of Contemporary Art, C-189 Submarine Museum, or Russian Vodka Museum. Sights like Strelka, Russian Admiralty, and St. Isaac's Cathedral are must-sees while exploring the area. You can watch performances at Mariinsky Theatre, Alexandrinsky Theatre, and Oktyabrskiy Big Concert Hall if you're interested in local theater.