01 - Combine drained lychees, lychee syrup, coconut milk, lime juice, and agave syrup if using in a blender. Blend until completely smooth and frothy, about 30-45 seconds.
02 - Fill two tall glasses with ice cubes, leaving about 1 inch of space at the top.
03 - Pour the blended coconut lychee mixture evenly over the ice in both glasses.
04 - Top with extra lychee fruit, lime slices, and fresh mint leaves if desired. Serve immediately while cold.