Mojitos are typically garnished with a lime wheel or a fresh mint spring, and I also like to garnish with a sugar cane stick if I can find them at the store. For these watermelon mojitos, I highly recommend chopping any extra watermelon into smaller pieces and using that as an eye-catching garnish for this tasty watermelon mint drink. I also like to scoop some watermelons with a tablespoon and freeze them to make watermelon ice cubes.