Based on your sort of acrobatic-antics and things that you post, I think you'd be more of an airbender. Air provides the highest mobility of the 4, and while water is a close second, I could definitely see you pulling some crazy airscooter stunts.
I love the water, but I’m a fire sign. And I could still fly around as a fire bender. Don’t you remember Fire Lord Ozai blasting around with his fire-bending rocket power?