There is a beautiful lake at 13 km from the Vilnius University, a perfect spot for swimming. Lake Balžis takes 17 minutes of driving by car. Going by bus is also possible, it takes a 35 minutes busdrive (1 euro, pay at the driver) and 1.5 km of walking to reach the lake. Bus 39 is taking you there in 14 stops. You get the bus at ‘Nemenčinės plentas’ and get out at ‘Balžio ziedas’. Oh, and don’t forget to pack your swimware!