Glowing feather hat - Inside the box factory where you can purchase the crates (top right corner of the level).
Red feather hat - Jsi museum, somewhere around Maccus gun shop.
Cyan feather hat - The hotel right underneath Jenni's Secret shop. The one that you could go to the window.
Green feather hat - Next to BBZ (Blazian Bandits Zone) it's the house under skate shop.
Rainbow feather hat - South ridge where the big hole is at, it should be to the left of that. There is no entrance but run up against the wall.
Purple feather hat - Magus building. The building right above the big hole in south ride.
Hope this helps guys