Ever since I read Swiss Family Robinson, as a child, I wanted to live in a tree house. My favorite spot to go was high up in the Dogwood tree that grew beside our old house in Wyckoff, NJ. I still love tree houses and climbing trees.
Pink Muhly grass - Cotton Candy Grass - Withstands heat, humidity, poor soil and even drought. Very easy to grow, it reaches a mature height of feet tall and gets feet wide. Grows in all U.S zones.