spontaneous ideas are the best!! :]
so long as you never think 'that's impossible' you're starting off right..
there's nothing bad about planning at all, and I like the idea that somone would care enough to plan what they do and say. But at the same time, there's something rather romantic about someone being so overwhelmed by you that they just get the urge to run off and do something out of the ordinary.
And come on, every girl (secretly) loves to be wooed!
Oh and edit: not every girl loves spontaneity, I think it depends on the person just as much as the gender.