Here's a short list of nearby attractions, and all of them aren't all that far away from our hotel:

Dvortsovaya Ploshchad (Palace square) is the main city square. Just like Red Square in Moscow, Palace Square in Saint Petersburg has been home to many historic and important events.
The State Hermitage Museum - the 2nd largest art museum in the world. The all-time favorite attraction for all first-time travelers to St. Petersburg.
The Alexander Column - the largest monolith to have been lifted into an upright position. This astonishing piece of architecture commemorates the Russian victory in the war with Napoleon’s France.
The General Staff and Ministries Building - located in Palace Square, its famous long bow-shaped facade is gorgeously connected by the triumphal arch. The eastern wing used to be the H.Q. of Foreign Ministry and Finance Ministry, but in 1993 was transferred to The State Hermitage Museum.
The Admiralty - one of the oldest and most important buildings, the focal point of three main streets of the city. This complex used to be the shipyard; It had produced over 250 hundred warships during its 140 years of service.
St.Isaac’s Cathedral - was the main church of Saint Petersburg and the largest cathedral in Russia back in the days. Completed in 1858, this is an outstanding masterpiece of late classicism. Hit 300 steps up to the colonnade to enjoy the magnificent 360-degree view over the city.
The Bronze Horseman - Catherine the Great's tribute to the founder of the city, an impressive monument of Peter the Grand. The statue's pedestal is the colossal Thunder Stone - the biggest monolith boulder ever moved by human beings.
The Strelka of Vasilyevsky Island - the eastern tip of the island is a harmonic ensemble of St. Petersburg's architecture. The Rostral Columns and Old Stock Exchange form a glorious vista of the city.
The Rostral columns - commemorating the strength of the Russian fleet, these columns served as beacons to guide ships. Nowadays you can see a gas flame lit at the top only during special festival celebrations.
The Kunstkamera - officially known as the Museum of Anthropology and Ethnography - is the first museum in Russia. The amazing collection of exhibits was started by Peter the Great himself.
The Pushkin Apartment Museum - is a memorial museum dedicated to the last period of Alexander Pushkin’s life and creative work showcasing numerous literary and historical exhibitions. No visit to Russia is complete without learning about its greatest poet.
Kazan Cathedral - named after the icon of the Lady of Kazan. With its enormous scale, impressive colonnade, garden, and central fountain - this place is breathtaking and eye-catching from the outside.
House of Books (Dom Knigi) - this famous bookstore housed in a historic and outrageously beautiful building originally built by the Singer Sewing Company has a lot to offer if you are into reading, especially in Russian.
State Russian Museum is the world’s largest collection of Russian art, housed in a unique architectural complex. The museum collection contains over 400 000 exhibits covering over more than a thousand years.
Church of the Savior on the Spilled Blood (Church of the Resurrection of Jesus Christ) was built on the site where Alexander II was fatally assassinated. The church has an incredible collection of mosaic icons. In and out, this place is photogenic and fabulous.