The river that runs through this lovely town is full of fish (apparently) and old trees,very fast flowing wouldn't stand much luck if you fell in!! I spent the odd evening fishing, but the only thing I caught was a chill... I think the locals were kidding about the fish !!! But it past a few hours anyway and kept me out of the pub !!i
If you are fond of hiking I can suggest a mountain area called Skrimfjella and Raje. 20-30minutes from Kongsberg on a small gravel road you can start your walk up to either the Skrimtoppen or the Styggemann mountain. Both are above 800meters. From the top you can see all the way to the Oslofjord.