Hi, Watershoes are definitely mandatory, if you don't take your own they will make you rent shoes at the falls for $15.00/pair. I chose to buy my own from walmart before going to Jamaica (not sure i want to wear someone else water shoes..LOL).Climbing the falls is a wonderful excursion, enjoy. my hubby and I are taking our kids there in April as Ocho Rios is one of our ports.
Have Fun. It's gorgeous, get your guide to take pictures of you with your camera under the falls.