First up is a tribute to Minecraft - Builder Goat. You need to find three blocks. The first is dirt, found up the hill behind the skate park. It is in the shadow of a large tree.
Speaking of those windmills, you will need to visit them again. Use the fans just below the cliff to get up there, or take the path from earlier.
You need to drag the wind statue back to the skate park with you. There is a torch-lined path that leads to the wind altar just to the left.
By placing the statue on the altar, you are transformed into Tornado Goat!
You now have the power to draw things into a swirling cyclone of doom all around you! Just press the R key to turn it on and off.
And finally, jump off the bridge nearest to the carnival and you will find a sewer pipe just beneath it.
If you swim inside, you will unlock the mod for Repulsive Goat. That's all you need to do - just swim in and then back out, and you have your new power!