Wrap a large elastic band down the center of the watermelon. Adjust, so the rubber band is placed vertically in the center of the watermelon.
Place a second large rubber band horizontally down the center of the watermelon.
With a sharp knife, cut into the top right and left quarter of the watermelon, about 1" from the rubber bands, to create a "handle" for your watermelon basket.
With a melon baller, remove watermelon flesh from the cut pieces, the handle, and the bottom "basket" portion of the watermelon—place in a large bowl.
Use the melon baller to cut balls from cantaloupe and kiwi's, as well. Place in a bowl with watermelon, add blackberries, blueberries, and grapes.
In a small bowl, whisk together lime juice, triple sec, sugar, salt, and mint. Drizzle over fruit.
Gently transfer fruit into a watermelon basket. Serve and enjoy!