I’ve lived in Barcelona since 2010. Most of what I know about visiting the city, I learned by watching people get it wrong — from the queue at the Sagrada Família, from the next table at a restaurant on La Rambla, from the metro at Passeig de Gràcia at nine in the morning in August.
None of these mistakes ruin a trip. But together they cost a family a few hundred euros and most of a day, and every single one is avoidable if you know about it before you land.
Here are the eight I see most often, with what I’d do instead. All prices below were checked in September 2026.
Where to stay in Barcelona — our three picks
Generator Barcelona – private family rooms at hostel prices, five minutes from Passeig de Gràcia and metro Diagonal (L3/L5). Rooms are small and the bar downstairs is lively, so ask for a higher floor.
H10 Cubik – on the edge of the Gothic Quarter, with the Atic rooftop terrace and pool. You can walk to the cathedral, the beach and the Born from the door, which saves you metro tickets all week.
The Cotton House Hotel, Autograph Collection – the old cotton guild building on Gran Via, a ten-minute walk from Casa Batlló and the Sagrada Família side of Eixample. Quiet, grown-up, and the rooftop is the reason to book it.
Affiliate links: if you book through them we may earn a small commission, at no extra cost to you.
1. Assuming your children have to pay
This is the expensive one, and almost nobody tells you.
At most of Barcelona’s biggest sights, children are free — and the age cut-off is much higher than people expect:
- Sagrada Família — free under 11
- Casa Batlló — free under 12
- MNAC (the art museum on Montjuïc) — free under 16
- Museu Blau (natural history) — free under 16
- Museu Picasso — free under 18
A family of four with a 9-year-old and a 14-year-old walks into MNAC for the price of two adults. At Museu Picasso, both children are free.
So why doesn’t everyone know? Because the people selling you tickets don’t earn anything on a free child. Resale platforms quote you a “family ticket” or a per-person price, official sites bury the free-entry line below the fold, and the default assumption travels: kids cost money, so you budget for four.
What to do instead: before you book anything in Barcelona, open the official site of the attraction — not the reseller — and search the page for the word “gratuït”, “gratuito” or “free”. Do it for every single sight. On a week’s trip with two children it’s the single biggest saving available to you, and it takes about fifteen minutes.
The exception that proves the rule: the Big Fun Museum on La Rambla charges full adult price from age 6. A family of four pays €100 at the door. Private attractions price for families; public ones don’t.
2. Buying the wrong transport ticket
Barcelona’s ticket names are almost designed to confuse a visitor, and the wrong choice costs you €20–30 over a week.
The two that matter:
- T-casual — €13.00. 10 journeys, one person only. You cannot share it.
- T-familiar — €11.50. 8 journeys, shareable between any number of people. Everyone taps the same card through the same gate, one after another.
Read those again. The shareable ticket is cheaper than the non-shareable one. A family of four buying four T-casuals spends €52 for 40 individual journeys. The same family buying three T-familiars spends €34.50 for 24 shared journeys — which, at four people per trip, is six full family journeys. Most visitors don’t make ten metro trips per person in a week; they make five or six as a group.
Other numbers worth having:
- Single ticket — €2.90 (only worth it if you’ll genuinely travel once or twice)
- T-usual — €22.80, unlimited travel for 30 days, one person. Good for a long stay, pointless for a weekend.
- Hola BCN tourist card — €11.25 (48h), €16.20 (72h), €24.35 (96h). Unlimited, includes the airport metro.
- Children under 4 travel free and don’t need a ticket at all.
And one that catches people out every week: the metro L9 Sud to the airport is not covered by a normal ticket. It needs its own €5.90 fare, or a Hola BCN card. If you tap a T-familiar at Terminal 1, it won’t let you through.
The T10, by the way, no longer exists — it was discontinued in 2020. If a guide or a forum post recommends one, that page hasn’t been updated in six years, which tells you what else on it to trust.
Full breakdown of every Barcelona transport ticket here.
3. Turning up at the Sagrada Família without a time slot
The Sagrada Família does not sell same-day tickets at the door in any reliable way. Entry is by timed slot, slots sell out days ahead in summer, and the queue you can see from the street is people who already have tickets.
Park Güell’s Monumental Zone works the same way — timed entry, capped numbers, and in August the next available slot can be tomorrow.
What to do instead: book both the moment you know your dates, direct on the official sites. Not a week before. The moment you book the flights.
If you’ve left it too late, the free part of Park Güell — the woods, the viewpoints, the paths above the Monumental Zone — is genuinely worth the walk on its own, and the best view of the city from up there doesn’t cost anything.
How we do the Sagrada Família with two kids · Park Güell with children · Barcelona Family Trip Cost
4. Stacking three Gaudí buildings into one day
It looks efficient on a map. It isn’t.
Casa Batlló and Casa Milà are a five-minute walk apart on Passeig de Gràcia, so people assume the rest of Gaudí is nearby. The Sagrada Família is a twenty-minute walk or two metro stops away. Park Güell is up a hill in Gràcia, and the walk from the metro is steeper than anyone warns you. Casa Vicens is in a different neighbourhood again.
Three Gaudí sites in a day is around €80–100 for two adults, four hours of audio guides, and two children who have stopped looking at anything by site number two. By the third, you’re paying full price for a building nobody in your group is still looking at.
What to do instead: one Gaudí interior per day, maximum. Put something entirely different beside it — the beach, a park, a market. The buildings are better when you’re not already full of them.
5. Eating on La Rambla
The predictable one, but it’s on the list because people still do it.
The tell is a laminated photo menu in six languages, a “traditional paella” priced per person rather than per pan, and someone standing outside inviting you in. Real paella is cooked to order, takes twenty to thirty minutes, and is priced for a minimum of two people from one pan. Anything that arrives in ten minutes came out of a freezer.
What to do instead: walk two streets inland — in either direction. El Born, the upper Gothic Quarter near the cathedral, or the streets behind the Boqueria. The price drops by a third and the food stops being a photograph of food.
And if you want paella specifically, eat it at lunch, by the sea, and don’t order it in the Gothic Quarter at all.
6. Going to Barceloneta and deciding Barcelona’s beaches are bad
Barceloneta is the closest beach to the centre, which is exactly why it’s the most crowded, the most worked by hawkers and the least pleasant in July and August.
Look for more information about the beaches in this post: Barcelona Beaches
And if you have a whole day, get on the R1 and keep going. El Masnou Beach
7. Ignoring free Sunday afternoons
Barcelona’s municipal museums are free every Sunday from 3pm, and free all day on the first Sunday of each month. That covers MNAC, Museu Picasso, Museu Blau, the history museum and several others.
Most visitors spend Sunday afternoon shopping — and most shops in Barcelona are shut on Sundays. It is the single most wasted afternoon of the average trip.
What to do instead: put your one big museum on Sunday at 3pm and save €30–40. Go at 3pm sharp rather than 4:30, and go to a less obvious one — the queue at Picasso on a free Sunday is a genuine wait, while Museu Blau out at the Fòrum rarely is.
8. Carrying your phone in your back pocket on the L3
Barcelona’s pickpockets are skilled, non-violent and extremely patient, and they work the routes tourists use: the green L3 line between Passeig de Gràcia, Liceu and Drassanes, the escalators at Sagrada Família, and the crowd outside the Boqueria.
Nothing dramatic happens. You simply arrive somewhere and your phone is gone.
What to do instead: front pockets only, bag across your body and in front of you on the metro, and nothing on the table at an outdoor café — not for one minute, not while you’re sitting right there. If someone bumps into you, spills something on you, or asks you to sign a petition, your hands go to your pockets first and your attention second.
This isn’t a reason to be nervous. It’s a reason to change one habit for a week.
The mistake I’d add if I could only pick one
Trying to see all of it.
Barcelona is a small, dense, walkable city, and that fools people into thinking it can be finished. Every visitor I’ve met who left disappointed had a list; every one who left saying they’d come back had an afternoon with nothing planned in it.
Pick four things. Do them properly. Spend the rest of the time sitting outside somewhere in a neighbourhood you can’t pronounce. That’s the city.
Frequently asked questions
What is the biggest mistake tourists make in Barcelona?
Paying for children who could go free. Children are free under 11 at the Sagrada Família, under 12 at Casa Batlló, under 16 at MNAC and Museu Blau, and under 18 at Museu Picasso. Most visitors budget for the whole family because resale sites don’t highlight it. Check every attraction’s official website before booking.
Which Barcelona transport ticket should I buy?
For a group, the T-familiar at €11.50 — it gives 8 journeys and can be shared between any number of people. The T-casual at €13.00 gives 10 journeys but cannot be shared. Children under 4 travel free. The airport metro needs a separate €5.90 fare or a Hola BCN card.
Is La Rambla worth visiting?
Walk it once, early, and don’t eat or shop there. The restaurants are tourist-priced with frozen food, and it’s the busiest pickpocketing stretch in the city. Two streets inland in either direction the prices drop by about a third.
Are Barcelona’s museums really free on Sundays?
The municipal museums are free every Sunday from 3pm, and free all day on the first Sunday of the month. That includes MNAC, Museu Picasso and Museu Blau. Arrive at 3pm rather than later, as queues build quickly at the best-known ones.
Do I need to book the Sagrada Família in advance?
Yes. Entry is by timed slot and slots sell out days ahead in summer. There is no reliable same-day door ticket. Park Güell’s Monumental Zone works the same way. Book both on the official websites as soon as you have your dates.
Which Barcelona beach should I go to instead of Barceloneta?
Bogatell or Mar Bella, both about fifteen minutes further along the coast, with far more space and calmer crowds. Nova Icària is the easiest with small children. It’s the same sea — only the crowd changes.
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