If you want to add a bit of extra culture to your getaway, put Petersburg Avant-garde Museum on your itinerary. Check if guided tours are available or just roam around in your own time.
Situated in Petrogradskaya District, this museum is well worth including on your itinerary. But you'll find tons more to see in this area. State Hermitage Museum and Winter Palace, Church of the Savior on Spilled Blood, and Russian Museum aren't too far away from Petersburg Avant-garde Museum.