3 days near near Barcelona
 

We would like to spend 3 days in some beach south of Barcelona
We are an elder couple so the place has to be quiet
We would like to visit Barcelona only one day so the beach has to be very near
Any suggestions?

First, ask the moderators to change the tag on this thread so it is NOT identified as a trip report -- a trip report tells others about trips that already happened, not ones you are planning. You can make that repost by clicking the orange triangle to the left.

Second, please consult a good guidebook -- perhaps the Michelin Green. (I'm not a beach person, and so can't answer.)