Sorry I didn't come back here sooner, it got really crazy at work. Anyway, I can't say that it is or is not that dangerous. What I can say is that there were teams that worked together in Ocho Rios. The driver would take their fare to an alley/street and his friends would mug the occupants. That being said, they have tried to clean that up. If you get a certified cab driver, you probably would not have any problems. Still, though, I highly recommend an organized tour or group. Shoretrips is a good one and excursions through the ship. The ship has checked out the vendors. I'm not saying it's a 100% guarantee that they're good, but it's better than not knowing the vendors at all.