Erä Eero runs awesome overnight trips to its 18-person observation cabin (six places are accessible for wheelchairs), where you may see bears and beavers between April and October, as well as wolves, lynx, wolverines and birds of prey year-round. Coffee and snacks are included, along with sleeping bags (bunks are available). Breakfast costs €8. It's 27km southeast of Lieksa.
Another hide further down the valley allows photographers to get up even closer, with 14 places for cameras.