PD : Do NOT flash your valuables, anywhere. Back in the 80s, a huge asshole of a politician took over a thousand people from one of the worst places in Colombia and transplanted them to the Island, they reproduced and hate work, therefore they are a big crime vector. There ARE big gangs in the town, avoid El Cliff, La Loma and sometimes Juan XXIII (even though my uncle lives there).
Enjoy San Andres!
Enjoy San Andres!