Hi there,
Check out the map of St. Petersburg https://maps.yandex.ru/?source=serp_...83%D1%80%D0%B3
You should be interested in 3 districts:
1. Central (Центральный район), explore it pretty everywhere starting from Nevsky Prospect and you`ll find lots of interesting stuff without any guide
2. Petrogradsky (Петроградский р-н), Petrogradskaya or Gorkovskaya stations, I recommend the southern part
3. Vasileostrovsky (Василеостровский), the subway st. is under recconstruction, but the island is withing walking distance (or bus) from Nevsky pr \ Central dstr. I recommend the south-eastern part.
Do not go alone in other districts if not necessery.
Are you familiar with some russian? What are you interested in?
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