Flowpark Vierumäki is an ecological adventure park at the Vierumäki sports institute campus in Heinola. The park has ten courses across difficulty levels, with rope tracks built into living trees up to 20 metres high without harming them. Tasks include swaying paths, liana jumps, swings and zip lines, and no prior experience is required since a safety briefing precedes every visit. The mix works for both children and adults, with climbers continuously clipped into a safety cable. The location alongside the Vierumäki sports institute's wide range of facilities makes it a natural part of a longer stay at the resort. Open in the summer season and closed in winter.