So this is a great activity, but you might want a rental car with some serious ground clearance (like a jeep maybe?) to get up the "road" to the site parking area. There is a small space by the main road where they meet you with an ATV and you follow them (drive) back to a gated entrance road. A bit confusing, but look for the area with their sign and just pull off the road, wait and remember the concept of island time.
AFTER all that, the experience is great. People running this place are hard core animal lovers. At the main trailhead facility they have goats, sheep, a pot-bellied pig, a dog, a cat, chickens, peacocks. Its a real menagerie, but its like a mini petting zoo while you wait to be paired with a horse than matches your size and riding experience. And I'll say, that my horse was by FAR the best animal I have ever ridden on such a tour. Smart, mostly obedient, and very sure-footed.
The team made sure there were great pictures taken of everyone, and yes, there was an amazing waterfall view looking from the NorthEast back towards Iao Valley. This was ALOT of fun, and both my teenage kids loved it. Yes, there is red clay everywhere, so washable tennis shoes would be the right idea. Plan to drive back to the hotel barefoot, and bring a bag for your shoes.
By the way, the dude in the red shirt on the pale horse...true Paniolo and quiet the character. Definitely adds to the whole experience. Highly recommend!