As Alana suggested in a comment of one post I am showing a place close by us. It's not in walking distance but about 15 minutes by car in Helsinki. It is a rhododendron park, I'm not usually a huge fan of the rhodo, but in a settings like this where the rhodo has plenty of room to grow large and it has good conditions to grow these bushes get truly impressive. Some of the bushes had bloomed already but it seems that the flowers are almost as beautiful on the ground as on the branches.
Amazingly I had never been there before, although I have always lived quite close by it. A friend of our suggested this place for us in facebook and also one blogger I follow had been there just a short while ago.