Itinerary for 4 day trip to Denmark

Here's a suggested itinerary for 4 days in Denmark that includes your constraints:

Day 1: Arrival in Copenhagen

Check into your hotel and freshen up
Head to , a picturesque harbor area with colorful buildings and plenty of restaurants for dinner suggestions
Take a canal tour to see the city from the water
End the day with a visit to , an amusement park with beautiful gardens and nightly fireworks

Day 2: Odense and Roskilde

Take a train to Odense, the birthplace of Hans Christian Andersen
Visit the and see the author's childhood home
Have lunch at one of the many cafes in the city center
Take a train to Roskilde, a historic city known for its cathedral and
Visit the , a UNESCO World Heritage Site
End the day with a visit to the , where you can see reconstructed Viking ships and learn about Viking history

Day 3:

Take a train or bus to , a theme park dedicated to the famous toy bricks
Spend the day riding roller coasters, seeing Lego sculptures, and building your own creations
Have dinner at one of the park's many restaurants

Day 4: Royal Danish Ballet and Departure

Spend the morning exploring Copenhagen's many museums, such as the or the
Have lunch at , a food market with plenty of options for all tastes
In the evening, attend a performance by the Royal Danish Ballet at the
Depart Copenhagen for your next destination

I hope this itinerary gives you a good idea of what to do during your 4 days in Denmark! Let me know if you have any other questions or if there's anything else I can help you with.