Flying would be cool. You could explore the sky and see lots of unique things plus it would be an experience no one else would have felt. Chicks would probably love to be taken flying assuming you could pull someone with you (like superman). But you'd probably be hunted by governments or jelous people due to the fact that your flying would immediatly stand out.
Invisibility opens up a number of possibilities. First, theres the obvious chick side of things, I'm pretty sure that would never in a million years get old. Next there is the contract killer jobs, you'd probably be able to pull just about any odd job off. Then there is ground exploration, you could go just about anywhere see just about any building. Want to be at the choosing of the next pope? Boom travel to Rome and stroll inside. Yea, you probably aren't perfectly silent at the beginning, but I'm sure you could get that way after a little practice and the right set of footwear. Even if you made a noise, someone investigating it would shrug it off as the house settling (unless you fell down the stairs or something retarded).