Preheat a grill or grill pan over medium-high heat.
Place the corn, squash and zucchini in a large bowl.
To make the dressing, add the olive oil, honey, cumin, salt, chili powder, black pepper, lime zest and juice and garlic to a mixing bowl or small mason jar. Stir or secure the lid and shake to combine. Pour two-thirds of the dressing over the vegetables and toss to coat completely.
Grill the vegetables, turning as needed, until really nice grill marks begin to form, about 5 minutes for the squash and 7 minutes for the corn in total. Remove to a baking sheet and cover with foil to keep warm.
Arrange the slices of tomatoes around the edge of a large cutting board or platter and season with a pinch or two of salt and pepper. Place the grilled vegetables around the platter thoughtfully, making sure to leave some of the tomato peeking through. Drizzle over the remaining dressing and shower with the queso fresco and cilantro.