My favorite place in whole city is situated off of the beaten track. It’s located in Kolomna disctrict, mainly known for the famous Russian writer Dostoevsky (use the sptnik guided tour in Russian to know more) as his characters lived here but also for Mariinsky theatre and my favorite canal (go on reading).
Nikolay Gogol, another famous Russian writer from the past (he wrote scary stories), said this about Kolomna: “Everything here does not resemble the rest of St.Petersburg; it is neither a capital nor a province”. This is still a bit right. I feel the same vibe in the district, as, for example, near El Peine De Viento by Chillida in San Sebastian, Basque country (well, I’m not sure you know it, but in case you do, you’ll need no further reading as you get the point).
So I recommend you walk down (or up) this Kryukov canal. Did you know Kryuk means “hook” in Russian? The thing is the canal is bloody straight. I guess it was named after some guy, but it doesn’t change the paradox of its name, right?
Then find Semimost’ye (7 bridges) point, watch all the seven bridges around and make a wish. Many people say it works!