I provide a day-trip with capturing story-times, which includes following points of interest (the amount of them depends on a time that you have in the city):
*St. Isaac’s Cathedral (panoramic view from the colonnade)
*Palace Square and Hermitage (the main museum of the city)
*The Admiralty building
*Nevsky prospect and the best bookshop and souvenir shop
*Kazanskiy Cathedral
*Church of the Savior on the Spilled Blood
*Peter & Paul fortress