Me and my 4 friends (23yrs) have a europe trip planned, we will be in Barcelona for 3 nights (second week of September) and would really like to see parts of France for a day trip. I know it is not a lot of time for a true french experience, but my friends would like to see atleast parts of France once in their life. What is a good city to day trip from Barcelona, considering time constraint. I saw some options online suggesting Perpignan or Collioure.
If anyone has any suggestion for a half day trip closer to Barcelona in Spain that we absolutely can't miss, I would also take the suggestion.