On July 27, 2018 at the Research Station of the Nencki Institute in Mikołajki, an open educational event BRAIN ON VACATION was held (this is the fourth edition, continuation of the Holiday Brain Days), organized by the Nencki Institute and the Research Station in Mikołajki. The new program includes, among others: fluorescence show, illusion zone, microscopic demonstrations, DNA isolation, neuroanatomical exhibition, games and tests for children and adults prepared by PhD students and employees of the Nencki Institute of the Polish Academy of Sciences. About 50 people took part in this event, who came to us from both land and water.