I spent a day in Zagreb, starting with Free Spirit’s walking tour, which gave me a good idea of the history and culture of the city. Then I spent the day checking out the upper town, which gives a good view of the city, Cathedral from the inside (it’s free unlike in Vienna and Budapest). I did the famous 6-islands tour, which covers the island Blue cave, Seal monk cave, Green cave, and Stiniva beach, and finally stops at the island of Hvar for lunch.