Cook rice.
Drain and set aside.
Fill a large pot of water half-way full of water.
Add 2 c. sugar (it should be sweet to the taste, if not - add more!)
Set aside.
In a blender, add cooked rice, evaporated milk, cream of coconut, vanilla and cinnamon.
Blend.
Put through a fine mesh strainer (it will be thick) and add to the sugar water.
Take the dregs of rice and add a cup or two of sugar water (from the large pot) back into the blender.
Blend again.
Strain.
Blend again if necessary. (I usually don't, but have at it!)
Discard extra rice (that won't go through the fine mesh strainer)
Serve cold or with ice.