Linnanmäki is the oldest, biggest (and only) amusement park in Helsinki. It’s conviniently located near the center and it’s easily reached by trams 3B, 3T and 8 or by several busses. For information on the ticket prices and opening hours, check Linnanmäki website.

Kirnu © by gnislew

The only zoo in Helsinki is Korkeasaari, an island reachable by ferry from Kauppatori or Hakaniemi, or you can take a bus from the railway station. More information about opening hours and fees can be found here: http://www.korkeasaari.fi/en/services/visitorinformation.