I took the trip a few years ago. Depending on the time you take the trip, it can be rainy and not much to see through the rain. The other consideration is safety. Some of the operators on Kauai have had accidents (which their ads fail to advise). IMHO, you are much better off taking one of the boat cruises (e.g. Captain Andy's) for much less money and much more sightseeing (5.5-6 hours).