I have gone out a couple times, once with a couple local fishermen, another with a glass bottom. With the fisherman, they used the traditional fishing line wrapped around jugs method, home made wooden outriggers. We got into several small tuna, was pretty awesome experience, although I was mostly a spectator.
Another time a guy I had met (American)asked if I wanted to go out on a flat bottom for half a day, he had one lined up. This time we brought our own gear, medium weight spinning rods, but the boat captain always wanted to troll far too fast for what we had for lures. Eventually we drove up the "North Negril River", and started casting, each guy taking one side of the boat. Buddy caught one small snook, but he saw a huge tarpon surface, I saw and caught nothing. But saying that, if I was to go out again, that's the spot I would want to go. Very quiet, never saw anyone else while on the river.