Jamaica Tours has an office in the Times Square Mall they are right in front at the road. I use them for each trip to YS Falls I love them I think last trip last year I paid around $75 and that includes Meal and YS admission fees as well as fun transport on a modern mini bus with an English speaking tour guide entire trip out and back as well, this office also offers combo tours that include YS I think its around $95 to get to Black River safari and Appleton rum but I personally do not like either of these and enjoying just spending the day at YS. YS Falls in my humble opinion the number thing to make sure you get to do when in Jamaica.
Your hotels also have reps they can hook you up on if ask.
If you have a second partial day to explore this same tour company goes to Mayfield Falls which is an interactive walk through a set of small stream freshwater falls, this is fun to experience and the whole trip hotel door back to door is only a couple of hours.
