To choose your own adventureland is to determine where you want to be. The phrase is a direct reference to the Choose Your Own Adventure series of children's books from the 1980s and '90s. The suggestion here is that one ought to also apply the notion to existence. Adventureland is a direct reference to Walt Disney's re-imaginings of remote jungles from various parts of the world, a space filled with new unknowns that need further exploration. Certainly one's journey is of utmost importance, but envisioning a destination couldn't hurt, no?