[mgkimsal]

Flight, because it'd be fun.

I fear there's more practical aspects to invisibility though. Flying while invisible would be the best of both worlds, from a 'getting stuff done' (good or evil) standpoint, but your experiment says we can't have both.

The first poster here illustrated many of the pros of invisibility already - I won't repeat them all.

But I'd probably still prefer to fly, at least for a bit.