Barcelona is one lovely and lively place to be, even for a short stay like yours. I am happy to remember these places ...

If I were you I would start with a walk along Passeig de Gràcia (start from Diagonal metro station) and visit first  Casa Milà (or La Pedrera) but be sure to get there early or you'll have to wait a very long queue) - that would take you more than one hour as you will find yourself wandering in delight through every corner of the house, not to mention the roof. Head then along the street to  Casa Batlló (I personally did not enter but is another wonderful example of Gaudi's talent - I think the pin in the right map is not correct, but the house is not easy to miss :) ). Continue along Paseig de Gracia until  Plaça de Catalunya - where you can do some shopping in the El Corte Ingles.

Do not miss the  Parc Güell, another Gaudi work of art and take your time to explore it (give it at least 3-4 hours). Street musicians and performers, the delicate intricacy of the alleys, the squirrels, the architecture - all soothe anyone's soul. To avoid the crowd near the main entrance try the entrance towards  Baixada de la Gloria. Start climbing this steep street from the Avenida Vallcarca - reachable from the  Vallcarca metro station - and do not let yourselves impressed by the not-so-beautiful neighborhood.  Maybe this map will help.

Take some time to walk along the seaside, in the  Barceloneta neighborhood, walk along Rambla del Mar and have a lunch in any of the numerous restaurants and cafeterias. Head then towards  Monument a Cristòfol Colom in Port Vell and climb up to the top - the view is worth the visit. Starting from there is  La Rambla a pedestrian boulevard full of cafes and souvenir shops (to see here: Casa Bruno Quadros and  La Boqueria - a market from where you must definitely buy some jamon - a dry-cured-Spanish-ham, very delicious on a slice of bread oiled with olive oil ;) - ask for "Jamon Iberico - pata negra"). It's mouth watering for me, already :) ...

Well, I hope this proves to be helpful for you ... enjoy your trip!

The beach, just go down grab a few drinks and hang out for a day and enjoy the relaxation.

Basílica de la Sagrada Família is a must - I am not a big church/museum person, but it is amazing. 

Quimet & Quimet for traditional tapas is really great. 

If you can get a reservation at Tickets. It will be more expensive but is an amazing experience.

Espaisucre is a great place to grab pre-fix three-course dessert, just make a reservation - best $10 I spent there.

Besides that spend a day walking around  La Rambla and the  Gothic Quarter eating, drinking and shopping

Make sure you see Parc Güell, Basílica de la Sagrada Família, La Pedrera (Casa Mila), and Montjuïc. Cheap bars are Espit Chupitos and El Gato Negro. 

Here are my favorite things in Barcelona after living there for a summer a few years ago.

Gaudi Architecture (MUST-SEE)

- Basílica de la Sagrada Família

     - Awesome Sangria at La Boulangerie Cafe. 1 block from Sagrada Familia at corner of Av. Gaudi & Carrer del Rossello.

- Hospital de Sant Pau

- Parc Güell - Go to the top of the park for the best lookout point over Barcelona

- Casa Milà /  Casa Batlló - Awesome and worth the price of admission. Go to the roof of Casa Mila for amazing architecture. 

- Favorite tapas restaurant: Cerveceria Catalana

- Lit-up fountain show Thursday-Sunday nights. Right off METRO Espanya. Best fountain show you'll ever see.

- La Boqueria (off of Las Ramblas) - Get the 1 euro fresh juices. They are amazing and you probably won't leave without having 7 or 8 of them

- La Rambla - Very touristy, but interesting street performers. Watch for pickpockets.

- Walk through the Gothic Quarter. Best churro shops in town is called Xarcuteria Degustació (definitely check it out!) for Churros con Chocolate. The main square in the Gothic Quarter is always packed with people and has a couple good clubs.

- Museu de la Xocolata is cool

- Camp Nou (where FC Barcelona plays)

- Not sure how warm it will be, but the best beaches are down by Barceloneta and Parc de la Ciutadella. Some great restaurants on the boardwalk down there. They always have a 'menu del dia' for lunch where you get a 3-course meal for somewhere around 10 euros. 

- Passeig de Gràcia is the big shopping district. Kind of like 5th Ave in NYC. 

- On certain nights, they have outdoor movies up on Montjuïc. That's where the old Olympic stadiums are too.

- If you can, take a train down to Figueres (about an hour away) and go to the Dalí Theatre-Museum. It's one of the best museums I've ever been to. 

- Best bars:

     -  Espit Chupitos - Walk to the end of Las Ramblas by the beach, turn left and walk about half a mile and you get to Chupitos. By far my favorite bar in Barcelona!

     - Dow Jones

     - Ice Bar

- Clubs (open around 1 or 2am and stay open until morning)

     - Razzmatazz

     -  Shoko

     - CDLC ( CDLC Barcelona)

     -  Opium Mar

     -  The Catwalk Club

     -  Sotavento Beach Club

     - Moog (a bit more casual)

     - Ghoa Beach Club

     - Any of the clubs down by the beach and by the port are usually good

Hope this helps!

hello, last year i've been in Barcelona and i spent really great time there. what i surely recommend to you is to take a walk on the street La Rambla, this place is magic. it conncects many people, culture, cusines, but definately if you dont want to spend a lot of many dont eat there, generally if you want to eat for cheaper money you should avoid restaurants on the main streets, it good to go to some small street and then you will find some nice place. Also you have to visit Parc Güell - park of Gaudi , its magic place, i love it. Yes  and of course if you like football, you should go on the stadium of barcelona team Camp Nou, but its quite expensive cause it cost around 20 euro per one person. good luck there :)

I would include Mercat Boqueria, lunch at Cal Pep Restaurant, the beach experience at La Barceloneta and getting lost in Barri Gotic (Gothic Quarter)

There is a place called  Harlem Jazz Club. Its great music but very small.  If you like to hanging out with the locals, that is the place.

Go to Parc Güell, Montjuïc and La Rambla area. 3 days is short to visit this amazing city :)

Gordon Attard
(tripleyourfun.com)

Walk La Rambla, being sure go a few blocks either side when things look interesting. Stop at Mercado de la Boqueria for lunch and spend an hour gawking, walk into hotels, snack at tapas bars. Sit awhile and watch the passing scene. Look around and realize 10% of the people on the street are pickpockets.

Barcelona is a lovely city, but 3 days should be enough to visit the main attractions. La Pedrera, Casa Batlo, Basílica de la Sagrada Família and Parc Güell are a must. The Barri Gotic (Gothic Quarter) Neighborhood is very nice as well... ;)

Hi! The must things to do in June in Barcelona are: eating a paella next to the beach bars on the sand, visit Basílica de la Sagrada Família and Parc Güell and walk to the charming neighbourhoods as El Born, Barri Gotic (Gothic Quarter) or Barcelo Raval. 

A walk down Passeig de Gràcia that leads into Plaça de Catalunya is a must.  The Ramblas is also a pretty street but can get very crowded with all the tourists. Rambla de Catalunya is a smaller street that has stores and restaurants and a huge sidewalk down the middle.  You cannot go to Barcelona and not see Gaudi buildings, but these can add up as they are about 20 euros to enter each one.  My personal favorite is Casa Batlló.  There is also the famous Parc Güell with the mosaic benches that I believe costs around 8 euros.  A gorgeous non-Gaudi building is the Consorci del Palau de la Música Catalana (Domenech i Muntaner).  Bar Tomas, located in the neighborhood of Sarrià (Barcelona), is one of my favorite restaurants there.  It is very cheap and has amazing patatas bravas, but it might be a little out of the way.  Also, exploring Gothic Quarter and  El Born was one of my favorite activities as it has a different personality in comparison to the rest of Barcelona.  There are many museums ( Museu Picasso, Galeria Toni Tàpies, Fundació Joan Miró, National Museum of Art of Catalunya, etc.).  If these interest you, buy the museum card to save money.  Going to the top of Montjuïc is also good for a good view.  I think Tibidabo (an amusement park) has the best view, but to save time you could go to MNAC (off of Placa Espanya) and then Montjuic for a great view as well.  On the way up, you could also see the Olympic.  

Parc Güell, Basílica de la Sagrada Família, Barri Gotic (Gothic Quarter) & beaches

Okay...

There is toooooo many attractions in Barcelona to have them all in three days. 

You are on a budget? Try the amazing places locals would visit..

Try this on a weekend for a chill out lookout bar with a nice surrounding:

La Caseta del Migdia

Have a beer and some "Tortilla de Patata" here El Filferro 

If you want to go for Tapas, download the Freebie guide on my Books homepage:

#BCN - by locals

If you need more infos get back to me and tweet me

1. Take a walk at Barceloneta the more you go the the edges the less touristy it gets.

2. Visit any museum I like Museu Picasso and Fundació Joan Miró Which has great parks around.

3. Late at night (3,00 and later) look for bars in Barcelo Raval or simply walk around Ramblas you'll find crazy people at lat hours.

Not original, but the Basílica de la Sagrada Família is the best thing I've ever done/seen anywhere.  AMAZING.  Worth the incredibly long lines.

Basílica de la Sagrada Família, Parc Güell, Sala Apolo