Salzburg is a beautiful city with a rich history and culture. Here's an ideal itinerary for 5 days in Salzburg:

Day 1: Arrival and City Tour

• Arrive in Salzburg and check into your hotel
• Take a walking tour of the city to get your bearings and see the main sights, including the Mirabell Palace and Gardens, Mozart's Birthplace, and the Salzburg Cathedral
• In the evening, attend a classical music concert at the Mozarteum or the Salzburg Festival

Day 2: Fortress Hohensalzburg and Old Town

• Take the funicular up to Fortress Hohensalzburg, one of the largest and best-preserved medieval castles in Europe
• Explore the fortress and enjoy the stunning views of the city and surrounding mountains
• After descending from the fortress, spend the afternoon wandering through the charming streets of the Old Town, stopping at cafes and shops along the way

Day 3: Sound of Music Tour and Hellbrunn Palace

• Take a Sound of Music tour to see the filming locations of the famous movie, including the Mirabell Gardens, Leopoldskron Palace, and the Nonnberg Abbey
• In the afternoon, visit Hellbrunn Palace and its famous trick fountains, which were built in the 17th century to entertain guests with water games and surprises

Day 4: Salzkammergut Lakes and Hallstatt

• Take a day trip to the Salzkammergut region, known for its stunning lakes and mountains
• Visit the picturesque village of Hallstatt, which is situated on the shores of Lake Hallstatt and is a UNESCO World Heritage Site
• Take a boat ride on the lake and enjoy the breathtaking scenery

Day 5: Eagle's Nest and Berchtesgaden

• Take a day trip across the border to Berchtesgaden, Germany, to visit the Eagle's Nest, Hitler's former mountain retreat
• Enjoy the stunning views from the top of the mountain and learn about the history of the site
• Return to Salzburg in the evening for a farewell dinner at one of the city's many excellent restaurants

I hope this itinerary gives you a good idea of what to do during your 5 days in Salzburg. Enjoy your trip!