I can't write anything that hasn't already been said--the treehouse is AMAZING! In fact, the whole property is a really special place. It's so lush and green, with such gorgeous plants, and so many beautiful little cabins and spaces. The view of Sunset Beach from the deck, looking through the beautiful foliage, is magnificent, and then at night the view of the stars (especially when you turn all the lights off!) is marvelous.
We trotted down to Ted's (A MUST GO) to grab dinner and dessert and ate on the deck with a bottle of wine every night. It was the first time I felt I was experiencing "real" Hawaii, not the tourist traps that characterize other parts of the island.
John was always great about communication and there was always someone on the property to help us out if we needed it.
A few things to keep in mind before you go:
1.) there aren't that many food places around, and it's a bit difficult to get to them since the treehouse is a bit out of the way. I advise you either stock up at the grocery, which is a little drive down Kam highway, or do what we did--grab dinner and dessert (and, for that matter, breakfast and lunch) at Ted's Bakery.
2.) the treehouse is quite a climb! We are pretty fit so it wasn't difficult, but nonetheless you get out of breath. Try not to bring too many things to haul up there!
3.) the treehouse is really open. We felt totally safe on the property, but we laughed that the treehouse had a key because a person could simply climb AROUND the door--there are no walls! The people who work on the property are very trustworthy, but in case you worry about roving randoms, perhaps bring a lockbox or leave valuables at home.
4.) Stay MULTIPLE nights! Two days were not enough for us :)