Here's a suggested itinerary for a 5-night holiday in Barcelona from the UK:

Day 1: Arrival in Barcelona

• Fly from the UK to Barcelona-El Prat Airport.
• Transfer to your hotel and check-in.
• Spend the afternoon exploring the neighborhood around your hotel and getting familiar with the city.
• Visit La Rambla, Barcelona's famous pedestrian street, and enjoy the lively atmosphere.
• Have dinner at a local tapas bar and try traditional Catalan dishes.

Day 2: Gothic Quarter and La Sagrada Familia

• Start your day with a visit to the Gothic Quarter (Barri Gòtic), one of Barcelona's oldest neighborhoods.
• Explore its narrow streets, charming squares, and Gothic architecture.
• Visit the Barcelona Cathedral and stroll through the picturesque Plaça Reial.
• In the afternoon, visit the iconic La Sagrada Familia, Antoni Gaudí's masterpiece.
• Explore the interior of the basilica and marvel at its unique architecture.
• Enjoy dinner at a local restaurant and savor the flavors of Catalan cuisine.

Day 3: Park Güell and Casa Batlló

• Head to Park Güell, another creation of Gaudí, known for its colorful mosaics and unique architectural elements.
• Take a walk through the park and enjoy panoramic views of the city.
• Visit Casa Batlló, a stunning modernist building designed by Gaudí.
• Explore the interior and learn about the unique design features.
• In the evening, dine at a trendy restaurant in the Eixample district, known for its modernist architecture.

Day 4: Montjuïc and Magic Fountain Show

• Spend the morning exploring Montjuïc, a hill with beautiful parks, museums, and panoramic views of the city.
• Visit attractions like Montjuïc Castle, the Olympic Stadium, and the Montjuïc Botanical Gardens.
• Take the cable car or walk down to the waterfront and enjoy lunch at a seaside restaurant.
• In the evening, head back to Montjuïc to witness the Magic Fountain Show, a spectacular water and light show.
• Enjoy dinner at a restaurant in the trendy neighborhood of El Poble-sec.

Day 5: Barceloneta Beach and Gothic Quarter

• Take a leisurely morning stroll along Barceloneta Beach, one of Barcelona's most popular beaches.
• Relax on the sand, go for a swim, or try water sports activities.
• Enjoy lunch at one of the beachside restaurants, sampling fresh seafood dishes.
• In the afternoon, return to the Gothic Quarter to further explore its charming streets and visit local shops.
• Climb to the top of the Columbus Monument for a panoramic view of the city.
• Have a farewell dinner at a rooftop restaurant, enjoying the view of Barcelona's skyline.

Day 6: Departure

• Enjoy your final breakfast in Barcelona.
• Check out of your hotel and transfer to Barcelona-El Prat Airport for your return flight to the UK.

Please note that this itinerary provides a general framework for your 5-night holiday in Barcelona, and you can customize it based on your preferences and the specific attractions or activities you wish to include. Barcelona offers a rich blend of culture, history, architecture, and culinary delights, ensuring a memorable holiday experience.