No, didn't have any suitable trees in backyard in which to build a treehouse, BUT I used to build a cubby-house, using branches from mango trees, from back fence ( my Aunt's house), to wire, from which grew climbing roses.
I'd set up table, with cloth, & chairs, get Mum & Dad to come & have morning or afternoon 'tea' with me from my little tea set!
My imagination knew no bounds! Still doesn't! Yay!