I'm going to go ahead and make it perfectly clear what I understand the OP to mean, so that it would be understood exactly what I mean.
If I could never feel pain, never age past 25 or so, and never receive any wounds of any type. As in being hit with a bullet would have the same effect as a feather falling onto my chest.
I would spend a long while receiving all the money I could ever hope for, falling very long distances, jumping into big wood shredders just to see the machine break, doing illegal stuff to see cops' faces when they shoot me, forcing NASA to send me to the moon, forcing them to come pick me back up, forcing them to send me to Mars, then forcing them to come pick me up (etc. as technology grows so that it will always be possible to retrieve me from each planet), ruling the world, getting eaten by sharks only to burst out of him after a few hours.
And so on.