While doing research for our road trip in the Westie last summer, down the Oregon Coast into California and then back again, I literally re-routed the whole trip back in order to spend a couple of nights in these delightful treehouses with my daughter. Totally worth it.
Out'n'About Treehouse Resort is located just outside of Cave Junction, Oregon - about a twenty minute drive from town (so bring your groceries with you if you don't want to be trekking back and forth).
As if it weren't enough excitement to be sleeping up in the trees, they have loads of other stuff to do there as well! Horseback riding, zip trekking, tie dye lessons, arts and crafts for kids, cave tours (including night tours by candlelight), a swimming hole, a firepit to sit and chat with the neighbours over, and so much more. I regretted only booking 2 nights there after I'd arrived.
The shot here is the Treehouse we'd booked for our stay, The Peacock Perch. Incredibly cozy and lovely inside (I wish I'd thought to take some photos of the inside) and a great view from our patio up above. Some of the treehouses have full indoor plumbing, but the Peacock Perch is only equipped with a sink and running water (as well as a mini-fridge). The washroom and showers were only steps from the base of the tree though, so it wasn't an inconvenience.
The owners also provided a full kitchen, fridge and freezers, as well as BBQ's for guests to make use of, and a delicious cooked breakfast was also included in the price every morning.
In retrospect, I wish I'd taken more (and better) shots while I was there. But I was enjoying myself far too much. Guess I'll just have to go back :)