Stockholm

Here's an ideal itinerary for 4 days in Stockholm, keeping in mind your constraints:

Day 1:

• Start your day with a visit to the Royal Palace of Stockholm, which is the official residence of the Swedish monarch. You can take a guided tour of the palace and explore the various rooms and halls.
• Next, head to Gamla Stan, which is the old town of Stockholm. This area is full of charming cobblestone streets, colorful buildings, and quaint cafes. You can spend a few hours wandering around, taking in the sights and sounds.
• For lunch, head to Östermalmshallen, which is a food hall that offers a variety of local and international cuisine. You can grab a quick bite to eat and then continue exploring the city.
• In the afternoon, visit the Vasa Museum, which is home to a 17th-century warship that sank on its maiden voyage. The ship was salvaged in the 1960s and is now on display in the museum.
• End your day with a visit to Skansen, which is an open-air museum that showcases traditional Swedish life. You can see historic buildings, farm animals, and even a zoo.

Day 2:

• Start your day with a visit to Djurgården, which is a large park in the heart of Stockholm. You can rent a bike or take a leisurely stroll through the park, taking in the beautiful scenery.
• Next, visit the ABBA Museum, which is a museum dedicated to the famous Swedish pop group. You can learn about their history, see their costumes, and even sing along to their songs.
• For lunch, head to Rosendals Trädgård, which is a beautiful garden cafe that offers organic and locally sourced food.
• In the afternoon, visit the Fotografiska Museum, which is a museum dedicated to contemporary photography. You can see exhibitions from both Swedish and international photographers.
• End your day with a visit to the Stockholm City Hall, which is a beautiful building that hosts the Nobel Prize banquet every year. You can take a guided tour of the building and see the famous Blue Hall and Golden Hall.

Day 3:

• Start your day with a visit to the Stockholm Archipelago, which is a group of islands just outside of Stockholm. You can take a ferry or boat tour to explore the islands and see the beautiful scenery.
• Next, visit the Moderna Museet, which is a museum dedicated to modern and contemporary art. You can see works by famous artists such as Picasso, Dali, and Warhol.
• For lunch, head to Södermalm, which is a trendy neighborhood that offers a variety of cafes and restaurants. You can grab a bite to eat and then explore the area.
• In the afternoon, visit the Stadshuset, which is the city hall of Stockholm. You can take a guided tour of the building and see the famous Blue Hall and Golden Hall.
• End your day with a visit to the SkyView, which is a gondola that takes you to the top of the Ericsson Globe. You can see panoramic views of the city from above.

Day 4:

• Start your day with a visit to the Stockholm Public Library, which is a beautiful building that offers a variety of books and resources. You can take a guided tour of the building and see the famous rotunda.
• Next, visit the National Museum, which is a museum dedicated to Swedish art and design. You can see works from famous Swedish artists such as Carl Larsson and Anders Zorn.
• For lunch, head to Kungsträdgården, which is a park in the heart of Stockholm. You can grab a bite to eat and then relax in the park.
• In the afternoon, visit the Royal Djurgården, which is a large park in the heart of Stockholm. You can rent a bike or take a leisurely stroll through the park, taking in the beautiful scenery.
• End your day with a visit to the Stockholm Cathedral, which is a beautiful church that dates back to the 13th century. You can take a guided tour of the church and see the famous statue of St. George and the Dragon.