Scott believes that "you can't train people to be enthusiastic, nice, fun, great people. you have to hire that." based on this, which hr activity would be appropriate for barcelona?

The most suitable word for Barcelona would be "enthusiastic". The word enthusiastic comes from the word itself which is "enthusiasm" that means a feeling of energetic interest in a particular subject or activity and a desire to be involved with it. For Barcelona, when you imagine the place, you ought to be interested in what's with the place and what does the place offer.