You might want to spend some time browsing the exhibits at Kirov Apartment Museum, Military History Museum of Artillery, or Anna Akhmatova Literary and Memorial Museum. Peter and Paul Fortress, Strelka, and Palace Embankment are well-known local landmarks worth a visit. You can watch performances at Bolshoi Saint Petersburg State Circus, Alexandrinsky Theatre, and Leningrad Center if you're interested in local theater.