Tervasaari is a little island and park that you can walk to on a long bridge from Kruununhaka suburb in central Helsinki. It is also the little green oasis you can see when going by ferry to Korkeasaari zoo. The long bridge is lovely with heaps of small boats on both sides, just look at the head picture of this blog. On the island you’ll find an old-style mat washing place, walking paths, a pond for dogs to swim in, and a playground. It has never been crowded when I have been there, even though it is not far from the city centre. There is also a restaurant on the island, but it is hardly free and I have so far never tried it as the island is also a great picnic spot.
The bridge to Tervasaari starts almost opposite the Military Museum of Finland at Pohjoisranta 19-21.