Linda's Coconut Horchata

Pour rice cinnamon and 3 cups water in a blender; blend until rice begins to break up about 1 minute.

Transfer rice mixture to a large bowl and stir in remaining 1 1/2 cups water; let stand for at least 3 hours whisking occasionally.

Strain rice mixture with a fine sieve into a large pitcher and discard rice.

Stir coconut milk sugar and vanilla extract into the pitcher. Chill completely and stir before serving over ice.