My cousin (19) had never seen Hook, so my best friend and I found a DVD and made her watch it (of course she loved it). However, I guess the story of us watching it isn't really the point of this thread...
Throughout the course of the movie, there were several times where Peter smiled or chuckled and was "happy" as far as the general definition goes. That being said, he couldn't actually fly until he realized what defined his happiness - what gave his life meaning: his fatherhood. Taking that into consideration, what would you think of that would enable flight for you?
I think mine would be my mother or my best friend. Thinking of either would probably get me off the ground.