If you have a car we recommend to go to the Port Olimpic (you can go even go without registering you car in the ZBE – Environmental zone (https://www.zbe.barcelona/en/index.html)) and parking is very easy in the BSM Marina almost directly from the Ronda Litoral (B-10). You can eat, go to the beach, to the many bars close to the beach or play volley ball.
Everybody who come to visit Barcelona knows about Gaudi and the Sagrada Familia but some people decide not to visit the inside because of the cost. I think it is still worth it to go because of the incredible light inside the cathedral. You can buy tickets on the internet (https://sagradafamilia.org/en/).
There is a new concrete floor to be installed in the basement to level out the old sins.
A way to get inspired is the experience section of airbnb. Other options for this type of information are Top10 from viator, withlocals, tripadvisor. If you do something you like please tell us and we will make a post to tell our other friends. My personal favorite is the best spa we have visited so far, the Aire de Barcelona.
