Hmmm..depends what he is like in real life....
In dream world, i'd like walk over start up a conversation, we'd get to know each other become good mates and have a good old chat like he does on the Eddie Trunk radio show - then he'd ask me to join GNR as the 4th guitarist - i would of course accept - and live happily ever after as a rock god - from time to time you all would listen to me talk about the albums following CD comming out when i'd be on the radio giving hints....
Ok i just woke up.
More likely, i'd go over and say like "hey axl" and he'd be like polite like most celebs are when they get stuck with a fan...he'd go like "hey" or something and then slip away back to his rock life...LOL