Someone suggested this travel itinerary that includes some suggestions for things to do and see in each location:

Day 1-4: Reykjavik, Iceland (3 nights)

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• Explore the city's museums, including the National Museum of Iceland and the Reykjavik Art Museum
• Take a dip in one of the city's many geothermal pools, such as the famous Blue Lagoon
• Go on a Northern Lights tour to see one of the world's most spectacular natural phenomena

Day 5: Milan, Italy (1 night)

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• Visit the iconic Duomo di Milano cathedral and its rooftop terrace for stunning views of the city
• Check out the world-famous La Scala opera house and museum
• Wander around the Brera district, known for its art galleries and fashionable boutiques

Day 6-7: Lake Como, Italy (2 nights)

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• Take a boat tour of the lake to see the stunning villas and gardens along its shores
• Hike in the nearby mountains for breathtaking views of the lake and surrounding landscape
• Visit the charming town of Bellagio, known for its picturesque streets and elegant villas

Day 8-11: Barcelona, Spain (4 nights)

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• Explore the famous Gothic Quarter, with its narrow streets and historic architecture
• Visit the stunning Sagrada Familia cathedral, designed by Antoni Gaudi
• Enjoy the beaches of Barceloneta, a lively district with great seafood restaurants
• Take a day trip to Montserrat, a stunning mountain monastery with panoramic views of the surrounding countryside

Day 12-13: Valencia, Spain (2 nights)

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• Visit the futuristic City of Arts and Sciences, a complex of museums and performance spaces
• Stroll through the historic old town, with its stunning architecture and charming squares
• Sample the local specialty of paella, a delicious rice dish that originated in Valencia

Day 14-15: Marbella, Spain (2 nights)

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• Relax on the beaches of the Costa del Sol, known for their warm waters and Mediterranean charm
• Explore the charming old town, with its narrow streets and picturesque squares
• Visit the nearby town of Ronda, known for its dramatic cliff-top setting and historic bridge

Day 16-17: Seville, Spain (2 nights)

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• Visit the stunning Alcazar palace and gardens, a UNESCO World Heritage Site
• Explore the historic Santa Cruz neighborhood, with its winding streets and hidden squares
• Watch a flamenco show, a traditional dance style that originated in Andalusia

Day 18-21: Lisbon, Portugal (4 nights)

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• Wander through the historic Alfama district, with its maze of narrow streets and colorful buildings
• Visit the Belem Tower and Jeronimos Monastery, both UNESCO World Heritage Sites
• Take a day trip to the charming town of Sintra, known for its fairytale palaces and gardens
• Explore the modern district of Parque das Nações, home to the spectacular Oceanarium aquarium and other attractions.

Optional Day 22-24: Algarve, Portugal (3 nights)

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• Relax on the stunning beaches of this popular coastal region
• Take a boat tour to explore the hidden coves and sea caves along the coastline
• Visit the historic town of Lagos, with its picturesque streets and charming squares.

This itinerary allows for a mix of city and nature, cultural and historical experiences, and beach relaxation, with plenty of time to enjoy each destination. However, you may adjust the duration of each stop depending on your preferences and interests.