We booked this through the Hyatts concierge, no, we were not staying there.... They welcome everyone! Very helpful, we booked it before we arrived since we heard it filled quickly and its the best one to 'Secret Falls'. We drove ourselves there, 40 min. From poipu, and they take you for a 1.5 mile shuttle to small harbor, dont think big boats...think many kayaks and some ' fern grotto' ferry tour boats.. The weekend has more traffic on the river, so it was perfect to go durring the week. Half day, we did the afternoon option. We kayaked up the river 2 miles, 12 boats or so, in a group...nice paddle. Enjoy the sun, wont see it once you start hiking through the gorgous rain forest. Evan was our guide, he was fantastic, full of more information than youd think you would want, and very entertaining! We hiked 1.5 miles m/L, easy hike, can be muddy if theres been much rain, but wow factor walking through that environment if you have never been. They send lunches for all and water, you eat at the falls. Our bunch got in to take pictures, but the water was cold so that was that..... The roosters have even found there way back there!