I was there this year for the Easter vacation!
Really beautiful and impressive. But Slovenia is not limited to this wonderful lake (a must visit) there are also the Postojna caves and the beautiful Predjama castle.
They also do amazing historical re-enactments in this castle.
Not to mention the Vintgard Gorges: 1600 Meters of river accompanied by waterfalls and rapids with enviable blue water!
Stunning places!