It turns out that treehouse accommodations, perfectly suitable for adults, are available in locations around the globe, from Alaska to Hawaii, from Turkey to Papua New Guinea.
Note: Some of these accommodations do not include any type of breakfast. Many require guests to be in reasonably good physical condition; some require excellent physical condition.
Five-Day Treehouse Stay
This is one of the treehouses that requires "excellent physical condition." Guests fly from Anchorage to a lake about two miles from the treehouse. Host Eric Schmidt will meet them there, leading them on a hike to the lodging which includes wading through a "large creek." When it's time to leave, you'll have to raft five miles down the creek before you can meet your return plane.
Eureka Springs, Arkansas
The rooms here are more in step with traditional bed and breakfasts, although no meals are served. Each cottage includes a private deck, a fireplace, a kitchen area and a Jacuzzi bath.
Tree Houses of Hana, Maui
Treehouse accommodations are available in three locations, and at least two of them are electricity-free -- tiki torches are used at night.
Treehouse Cabins at River of Life Farm
Several treehouse cabins are available here, sleeping 2 to 12 guests. Most cabins overlook the North Fork River in the Missouri Ozarks. The River of Life Farm is set on 350 acres and is adjacent to Mark Twain National Forest, so the treehouses are wonderful for those in search of a secluded getaway.
Out 'n' About Treehouse Treesort
Resort... treesort... get it? There are at least 10 treehouses available here, including several multi-story structures. The highest one is 37 feet off the ground. There are numerous swinging bridges to help guests get around.
Cedar Creek Treehouse
Ashford, Washington (near Mount Rainier)
This cabin is 50 feet off the ground in a giant cedar tree, with the trunk reaching up through the kitchen floor and continuing through the ceiling.
Green Magic Nature Resort
Kerala, South India
Access to this treehouse -- which is 86 feet off the ground -- is achieved by using an indigenous cane lift which employs a unique water counterweight. Once you're up there, you'll have a view of 500 acres of tropical rain forest.
Papua New Guinea
TreeHouse Village EcoResort
Kavieng, New Ireland, Papua New Guinea
This three-story treehouse includes a main suite on the first level, a second private suite on the second level, and single accommodations on the third level. A balcony looks out over the lagoon, outer reef and the Pacific Ocean.
Kadir's Tree Houses
This resort, not far from the Mediterranean Ocean, includes 40 tree houses with room for up to 145 people.