Red Superfly
You creepy little stalker
Green Lantern's powers?
I'd be noble, great, and honest, RIGHT UP to the point where I recieve the ring. Then I'd manifest a "powerful people killer" and wipe out anybody that has even the slightest amount of power, and become the President of the Universe. I'd keep Superman alive, and when he comes to save the day, I create some Kryptonite and have my brainwashed lackeys (Michael Jackson, Gene Simmons and Jemma Jameson) shove the Kryptonite up his ass. Then I'd send Busted, McFly, and Avril Lavigne into space and watch them choke.
Spider-Man's powers?
Now, this is cool, because I'd actually feel like fighting crime. I'd just web sling all day, every day. I'd be very much like Peter in this respect - with me being a little bit more selfish, because Pete's just TOO nice. I mean, would you let ANYBODY push you around when you can throw them fifty feet in the air, catch them before they go splat and they stagger away shaking in fear?
Batman?
There's no way in hell I'd not act like an ass if I had the freakin Batmobile. I'd wager on street races, win them, earn more money, and in my castle made of solid gold, I'd have a swimming pool (made from gold coins) and swim in it like Scrooge McDuck. I'd also buy the most advanced sniper rifle in the world and scare people sh*tless by just hoverring the laser sight over them from my bedroom window. Most really attractive women are gold diggers anyway so I'll be sorted there.