Chill the watermelon and tomatoes so the salad is extra crisp.
Whisk olive oil, lime juice, honey, salt, and pepper in a small bowl.
Combine watermelon, tomatoes, cucumber, and onion in a large mixing bowl.
Pour the dressing over the bowl and gently toss to coat.
Fold in feta, mint, and basil just until evenly dispersed.
Finish with a light drizzle of balsamic glaze, then serve right away.