NeKiPiSHui: A green island outside of the centre, but still reachable by the metro. Good place for picnic, rollerskating, or ice-skating at winter. There is also a palace on the island that you can visit.
NeKiPiSHui: This monument is quite massive, with many statues. Inside, there is a museum - but check the opening hours before going! You can get there by metro.