If you want to add a bit of extra culture to your getaway, put Taipale Canal Museum on your list. Check if there are any guided tours or just roam around at your leisure.
You're spoiled for sightseeing choice when spending time in Varkaus. Taipale Canal Museum is an ideal place to kick off here, but there are many other worthwhile places to visit. Water Tower Sightseeing Platform, Kämärin uimaranta, and Art Centre Vainola are not far from the museum and will fill in your day nicely.