Get the tastiest cantaloupe at the store by picking one that's heavy for its size with a sweet fragrance.
Line a large baking sheet with parchment. Spread cantaloupe in a single layer and freeze until firm, at least 4 hours and up to overnight.
In a medium bowl, whisk together lime zest and juice and honey until honey dissolves.
In a blender, combine cantaloupe, lime juice mixture and 1 1/2 cups cold water and blend until smooth, working in batches if necessary. Pour into 4 glasses, sprinkle with lime zest and serve.