So continue messing with her head LOL. Get lost sometime and don't bother letting her know where you're going. (Not literally...just take off and do something fun without her knowledge.) You are on to something there with that idea of messing with her head.
Don't give her explicit details for everything you do. Wait until she asks specifically about something you do then be a bit evasive.
Stuff like this takes a bit of advanced learning LOL. But I think you can do it. And do like Nike....JUST DO IT.