From Belgrade my plan was to fly to Budapest, and I happened to see a full-day stopover in Malta. I wish I had more time to visit friends there, but as I was on a mission to visit every country in Europe, I had to make cuts in my itinerary. One day was actually a good amount of time to explore the capital and catch up with my friends!
The area of Valletta is very walkable and quite beautiful to explore. My favorite things to do in a new place is to just wander and take photos; check out Upper and Lower Barrakka Gardens, Republic Street and Merchant Street. I also highly recommend taking the water taxis on a nice day!