One of your first stops should be Valkeakoski Tourist Office. Here, you'll be able to find your bearings and get some great tips before you set out exploring.
When you've finished up at this tourist information center in Valkeakoski, why not check out Saaksmaki Church, Rapola Castle, and Lotilanjärven uimaranta? They're not too far from Valkeakoski Tourist Office and also a hit with many travelers.