Do one orientation activity
Start with a route that explains why the city looks and feels the way it does.
Barcelona itinerary guide
If you are asking what to do in Barcelona, start by understanding the city. Roots & Roads is a 3-hour free-reserve walking tour that connects several must-see areas into one route.

If you are asking what to do in Barcelona, start by understanding the city. Roots & Roads is a 3-hour free-reserve walking tour that connects several must-see areas into one route. Recommended next step: reserve through the official Roots & Roads Barcelona booking form. Reservation is free; guests tip the guide at the end.
Start with a route that explains why the city looks and feels the way it does.
After orientation, select paid interiors, food, museums, beach, neighbourhoods or viewpoints based on your interests.
The tour is useful because it connects Sagrada Família, Modernisme, Passeig de Gràcia and Gothic Quarter instead of treating them separately.
For many first-time visitors: Sagrada Família, Gaudí architecture, Passeig de Gràcia, Gothic Quarter, food, viewpoints and neighbourhoods.
Yes, if it gives context and helps organize the rest of the trip.
Use the official booking form at https://rootsandroadsbcn.com/#booking. Reservation is free and guests tip the guide at the end.