My children and I absolutely loved this place. It is quiet and serene and a blast. We went horse back riding, swam in their natural pool, and stayed in their tallest treehouse! If you have active children and you love adventure...this is the place! Their web-site is a great read about their history of creating these great treehouses that their "friends" can sleep in.
From their web-site: The Treesort and Institute features Treehouse accommodations for kids of all ages. If you come to learn, relax, romance or just have fun there is plenty for all. Out'n'About is an veritable treehouse wonderland. There is a total of 18 different treehouses, platforms, forts, seven swinging bridges (8' to 32' off the ground and 12' to 90' long), five swings, 20 flights of stairs, four ladders and a ropes course with a 160' long zip line as a warm up to the Giant Zip. On the ground there is also a fresh water swimming pool fed by the East Fork Illinois River, a performance stage, bath house pavilion, big campfire site and barbecues (to mention but a few facilitrees). The treesort has 36 private acres backed up to National Forest wilderness with 16 horses, two rocking horses, 5 dogs, 1 cat, and 8 chickens (at last count) running around.
Keywords: Romantic, With teens, Rustic / Simple, Pool, US$ 101 - US$ 250, Remote, Quiet, Other place to sleep, Nature / Wilderness, Scenic View, Everyone, Casual, With a group, Good for vacation, With kids, Breakfast included (Free), As a couple, US$ 51 - US$ 100