Cube the watermelon into bite-sized pieces and place them in a large mixing bowl.
Cut the avocados in half, remove the pit, and slice the flesh. Add the avocado slices to the mixing bowl with the watermelon.
Drizzle the fresh lime juice over the watermelon and avocado, tossing gently to coat the ingredients.
If desired, drizzle honey or agave syrup over the salad for added sweetness.
Toss everything gently, being careful not to mash the avocado.
Sprinkle with fresh chopped mint leaves and give it a final light toss.
Serve immediately and enjoy!