We stayed in their treehouse. It's not so much a Swiss Family Robinson sort of dwelling but rather a house in the forest where you feel you're living in the trees. Incredible.
During one of our two days there, we hiked to the "plunge pool". Again, incredible. A small hot spring feeds the pool. The temp hovers around 78f - though it felt colder. They created the pool in the middle of a stream. Jay and Ben spent a lot of time swimming. It was too cold for Heather and I to spend much time in there, but it was very refreshing! If the day had been warmer, it would have been even more so.
Finally, for those planning to visit, you must plan to eat at their Italian restaurant for one meal. The way-off-the-beaten path setting makes the food even more amazing than it would be otherwise.