There is a very beautiful small lake in the Holosiyivsky forest. One may rent row boats and peddle catamarans which are renovated every season. Around the lake there are several cafes. We suggest having a mug of beer and German sausages in the Beer Garden. The cost of hiring a peddle catamaran is about 30Hr, a row boat - 40Hr. 
Getting there Take the blue line from the city centre to the Holosiyivska metro station. Your will be nearly there.