I've always been curious as to what people would do with the powers of the elements if they had them.
You have the power to manipulate water, fire, air, earth, bend them to your will and the only limit is your imagination. What do you do with them? Do you do good, do you do evil? Or do you just escape into a child like life of play and experiment?
Water - I would increase the Earths amount of drinkable water, and I would divert water away from cities so as to avert floods and disasters, much like the recent tragedy in Alberta with flooding. I would also use it for my own amusement, freeze and unfreeze empty lakes and what not, make ice towers and sculptures, and bring rain and water to areas of the world that do not have enough. And I would have it rain almost constantly through the summer as well *laughs* I would also explore the oceans and all the land we don't see, all the creatures and life we know is there but ignore.
Fire - I would almost purely have fun with this, see what happens to various things when they burn, burn patterns and images into wood and other substances, see what it would be like to throw fireballs, and cook food to a perfect temperature easily as well.
Air - Flying. And I would purify it the world over for easier breathing for all
Earth - Create an island for myself where no one could find me, unless I wanted them to!