Absolutely, I'd love to help you plan your 4-day trip to Belgrade! Get ready for an exciting adventure in this vibrant city. Here's a suggested itinerary for each day:

Day 1:

• Morning: Start your day with a visit to Kalemegdan Fortress, one of Belgrade's most iconic landmarks. Enjoy panoramic views of the confluence of the Sava and Danube rivers.
• Afternoon: Explore the bohemian quarter of Skadarlija, known for its charming cobblestone streets, art galleries, and traditional Serbian restaurants.
• Evening: Head to the trendy Savamala district for dinner and drinks. This area is known for its street art, live music venues, and hip bars.

Day 2:

• Morning: Visit the Nikola Tesla Museum to learn about the life and work of the famous inventor.
• Afternoon: Stroll down Knez Mihailova Street, Belgrade's main shopping and pedestrian zone. Stop for a coffee at one of the many cafes along the way.
• Evening: Experience Belgrade's nightlife by checking out one of the city's many clubs or bars. Ada Ciganlija, a river island turned recreational area, is a popular spot for evening entertainment.

Day 3:

• Morning: Take a guided tour of the Royal Palace, the former residence of the Serbian royal family.
• Afternoon: Visit the Museum of Yugoslav History to learn about the country's socialist past and see the resting place of Josip Broz Tito.
• Evening: Enjoy a traditional Serbian dinner at a local restaurant and sample some delicious rakija, a popular fruit brandy.

Day 4:

• Morning: Take a day trip to the nearby town of Novi Sad, known for its historic Petrovaradin Fortress and charming old town.
• Afternoon: Explore the vibrant street art scene in Belgrade's Dorćol district. Don't miss the murals and graffiti in the area.
• Evening: End your trip with a relaxing dinner cruise on the Danube River, taking in the city lights and skyline from the water.

I hope this itinerary gives you a good starting point for your trip to Belgrade. Enjoy your time exploring this dynamic city!