I am a crucian, and I am disappointed by someones post that you can't trust the locals. Why would you visit an island, then state you can't trust the locals. Maybe if you trust them, you may have a surprising experience. Crucians are generally friendly people, if you treat them as if you don't trust them, they may reciprocate. If you just enjoy the experience and all that the island has to offer, you would find that in most cases the locals will go out of their way to make you feel comfortable and welcome. My advice is to just be careful on any vacation, but being careful does not necessarily mean you can't trust the locals.