Add lime juice and olive oil to a large bowl and whisk briskly to emulsify. Add salt and pepper to taste.
Add cubed watermelon to the bowl and toss to coat evenly with dressing. Sprinkle with feta cheese, basil leaves (whole or torn into pieces) and pepitas. Toss to coat then taste for seasonings and add more if desired. Enjoy!
One Last Thing
If you're making this for a party or a potluck, use the watermelon rinds as serving bowls!