Combine tomatoes, onion, and dressing, to taste, and toss to combine. Add avocado and gently mix, being careful not to break up the avocado too much. Place 1 coconut 1/2 in 6 bowls. Spoon the salad among the coconuts. Garnish with cilantro leaves.
Combine lime juice, vinegar, honey, cumin, cilantro, salt, and pepper in a bowl and whisk to combine. While whisking, slowly drizzle in the oil. Whisk until well-combined. Reseason with salt and pepper, if necessary.