There is a unique place to spot rare lake seals and majestic ospreys. In the heart of the largest lake district in Europe, lays Linnansaari National Park. You can either explore the park by yourself or attend a guided tour, hosted by Oravi. One of the most memorable moments for me was to sleep in a tree in Linnansaari - sleeping in a tent suspended between the trees (tentsile) makes you feel like resting on a cloud in the middle of nature.