In a small saucepan, bring the water and sugar to a boil. Let boil for 30 seconds, remove from heat, and let cool completely. Once cooled, add to a blender or food processor with the cantaloupe cubes/balls. Blend until completely smooth.
To make the drink, add ice to a cocktail shaker along with a fresh mint leaf. Add the simple syrup and gin, and shake for 30 seconds. Fill glass with ice, a few melon balls and cucumber slices, and then pour in the drink. Top with seltzer, stir to combine, and garnish with mint, and extra cantaloupe/cucumber slices!
*Becasue of the thickness of the simple syrup, the cocktail is sometimes hard to pour out of the shaker because the puréed cantaloupe syrup and/or mint leaf gets stuck and blocks it from coming out! You might have to take off the lid of your shaker and just pour it into your glass if you want to get all the goodness in!
*If you can find it, cucumber flavored seltzer is amazing in these!
*This recipe makes a bunch of extra simple syrup, so these are great to serve to a crowd too!