Mostly, I enjoyed this trip but wasn't prepared for a few things not mentioned before we set out.
Kayak trip: I was alone on my adventure so was given a single-occupant kayak to paddle 2.5 miles up-river which wouldn't have been hard provided there hadn't been flash floods a couple of days before which made strong currents in the river causing my little kayak to head straight for the mangrove vines lining the banks. Our guide didn't offer any advice on how to avoid this and it happened to me 3 times causing me to be left way behind the rest of our group, all being in 2-man kayaks with 2 people each powering their boats. Several times I was out of sight of the guide as well as the rest of the group I was with. Luckily, it turned out okay but had the potential to be disastrous since I am far from being a good swimmer (yes, I wore a PFD).
The hike to the falls: EXTREMELY muddy and treacherous through most of it. We weren't warned of the river crossing of about 50-75 feet through rapids beforehand. The water was up to about mid-thigh and I'm 5'11". I was wearing good Tevas with a excellent tread, thank goodness. The hike was approximately a mile long through a beautiful rain forest to an idyllic waterfall where our guide made us a lovely lunch. After lunch, we retraced our muddy steps, complete with river crossing back to our kayaks after a swim in the pool underneath the waterfall. The kayak trip back down the river was much easier since we were going with the flow but because I was paddling alone, I was way behind the others again.
I would recommend this excursion if you're fit and have good footwear. But definitely be prepared for treacherous conditions! And ask to be put in a boat with another person if you're alone.