A tree house can serve both as an adult recreational area as well as kids' playhouse. Kids are absolutely crazy about tree houses as they offer them a secret lair of their own. On the other hand, even adults find tree house a cozy place to spend evenings. Hence, if you have large trees in your yard, you should probably think about building your own tree house. Building a tree house is a job which you can finish within a day, with a little help from your kids, which they would be so willing to lend.