You might want to spend some time browsing the exhibits at Grand Maket Russia Interactive Museum, C-189 Submarine Museum, or Rumyantsev Mansion. Explore landmarks like Moscow Triumphal Gate, Yusupov Palace, and St. Isaac's Cathedral. You can watch performances at Mariinsky Theatre, Tovstonogov Bolshoi Drama Theater, and Alexandrinsky Theatre if you're interested in local theater.