I loved the Rainbow Cottage at Puna Rainforest Retreat so much that I would have moved in if the host had let me. It is tiny but comfortable. I recommend no more than three people (four if traveling with children) plan to stay. There is a queen bed and a day bed with a trundle, which was a pleasant surprise. My two adult children and I each had a bed to ourselves.
The view of the Pacific Ocean across the well-maintained rainforest lawn and beyond the mist of volcanic steam was outstanding. I will always treasure sitting in one of the geo-thermal hot tubs under a sky full of stars so thick the Milky Way looked like clouds. Frogs provided a musical accompaniment.
Either eat a good meal before you go, or be sure to bring plenty of food. The retreat is located several miles away from "civilization," which makes it so special.