In a salad bowl, arrange the watermelon, tomatoes, cucumbers, olives, and feta cheese. To make the basil vinaigrette. In a glass jar, whisk the olive oil, balsamic vinegar, lemon juice, and honey. Add the basil and chives. Season with salt and pepper. Drizzle the vinaigrette over the the salad. Sprinkle with salt and pepper. Enjoy!