As an actor there is room for a certain amount of creativity but you're always ultimately going to be saying somebody else's words. I don't think I'd have the stamina skill or ability to write a novel but I'd love to write short stories and poetry because those are my two passions.
My friends are people who like building cool stuff. We always have this joke about people who want to just start companies without making something valuable. There's a lot of that in Silicon Valley.