Slovakia is beautiful... many nice places you can visit.. historical cities like Banska Stiavnica, Kremnica, Levoca, Trnava... open ait museums in Cicmany or Vychylovka.. Spa towns Rajecke Teplice, Trencianske Teplice... lots of castles, but the most beautiful are Oravsky zamok, Spisky hrad, Trenciansky hrad, Bojnice.. and if you want more nature, there are High Tatras mountains, Terchova, Slovensky raj and so on.. Im sure you wont regret to see any of it. If I were you I would go in later spring or fall..