Yana
The park was founded at the same time as Summer (Letny) Garden and is one of the most well developed parks in the city. It is really popular among tourists as it's close to the Church of the Savior on Blood so if you crave solitude go farther from the entrance. In summer the place looks gorgeous with all the flowers and the famous black swan in the pond. Have your snack on the steps of Mikhailovsky Palace or bring your kids to a playground with swings (they are actually quite big so you can also enjoy a ride with the view on the domes).