7) Don't assume the beaches are crime-free
When you are at the beach, you may feel so relaxed that crime is the last thing on your mind. However, beaches, especially the most popular and crowded ones like Barceloneta and San Sebastian are regularly the targets of thieves. Never sleep on the beach, as this is a swift way to get your possessions stolen.
Another strategy that thieves often use us to lay a towel on the sand right next to a tourist. If this happens to you, be careful and, of course, don't leave your belongings unattended as you take a dip in the water.
Since there is so much nightlife at the Port Olympic, people will often go to the beach to hang out at the crack of dawn. Remember that thieves are prowling around night and day, so be extremely careful even late at night.
Follow these safety ideas and tips, and you'll definitely be safer. Safety in Barcelona is no more complicated than most other cities, but you do have to take sensible precautions.