Flying is pretty cool. I do like the idea of complete environmental control. For example if you were some sort of sorcerer and you could rip chunks of earth out of the ground and send them hurtling towards groups of enemies, or just give life to trees and let them get revenge on the local logging business. Of course, this would mean TOTAL destructive environments which can be very complex, worms style. I'm not quite sure about invisibility, I mean, I'd like to be visible and sneak past armed guards only metres apart because it creates much mroe suspense, adrenaline and you get a greater feeling of success when you finally finish it. As for bashing people with insane strength, well, haven't you ever dreamed of having ultimate fights between enemies or just bashing someone to a pulp? (this sounds a bit violent but just picture it for a second). Imagine having massive fights like in the matrix with extremely unrealistic capabilities! Awesome! But personally, I think the best ability to have would be a tie between time travel and complete control of the elements as SiC6 said.
Cool, someone agrees with my environmental control powers! It would be fun to move all the oxygen away from people's faces, by manipulating air. Or maybe even rip off their finger nails with the dirt in between them. There is some type of environmental substance in or around us. Maybe making trillions of microscopic needles out of air, and puncturing every cell in the body. >8]
Complete invincibility! Imagine if you were to walk through the Ocean floor to another part of the globe without getting tired or losing your breath. Or jumping from the highest place in the world to see a breathtaking view then landing flat on your face but still alive or take over the world with an iron fist. The possibilities are endless.
Whats the point in invincibility? There would be no challenge, unless the challenge was against time or something and you had heaps of puzzles qand traps in your way or something, but that doesn't sound fun. As long as there is the possibility of losing something, people will try to win, and compete. Uless there is some sort of prize. Like money, everyone likes money.
It would be awesome if you could like switch brains with someone or something. So like you'd be in his body but still be you and have your thoughts and he would be in your body but with his mind. So you could switch run right in front of a car then right before it hits you switch back to your body.
I think theres a game coming out like that where you can copy the look and abilities of any person you see. That's actually pretty cool now that I think about it. It either is a game or another one of my crazy dreams....