Goku would Crush Superman in a duel....

Dude. Superman would win this hands down. I've never even heard of this Goku kid. But it sounds like he is still human. Superman is invulnerable, so unless Goku has MASSIVE amounts of kryptonite and is smarter than superman, then he's toast. All superman would have to do is use his laser eyes to cut the dude to shreds. Lets see him use his chi when his arm is flopping around the floor...

And yea, you forgot to mention that Superman also has the ability to control time...

Goku's actually an alien, too. He was raised and trained in martial arts by humans (well, sort of. Gohan and Roshi were human, but Koren was a cat, Kami was an alien, and King Kai is a god) on Earth (but his version of Earth has animal-people, aliens, witches, demons, magical dragons, dinosaurs, spaceships, and the President of the Earth is a dog, so...yeah), but he's actually a member of a warrior race known as the Saiyans.

All that said, he would not outsmart Superman. Goku has a good heart, but is far from the sharpest knife in the drawer. His idea of a good plan is "Hey, I'mma grab this dude from behind and you can kill us both!"