The Koli Hills offer many beautiful trekking trails, and the most popular of them is trekking to Koli Peak. The trek starts from Koli National Park Visitor Centre and involves a steep ascent. It is a challenging trek, but the view from the summit is worth the effort. You can see the breathtaking view of the hills, forests, and the serene lakes surrounding the hills. Remember to bring water and snacks as there are no designated cafes along the trail.
Pielinen Lake is located near the park, and you can rent a boat to explore its serene lake waters and scenic surroundings. The lake is home to many bird species, especially during the migration season. You can find a birdwatching tower near the lake, which will offer you a spectacular view of the lake and the beautiful nature around it. You can bring your own picnic lunch or head back to Koli National Park Visitor Centre for a meal at the cafe.
If you have more time, you can explore other trekking trails in the park, such as the Herajärvi Trail or the Paha-Koli Circuit. Both of them offer an incredible view of the hills and the forests around the park. You can also opt for a guided tour of the park, which will provide you with an in-depth experience of the park's history and ecology. If you have less time, you can skip boating or birdwatching and explore the nearby nature trails around the park.