Peel the mango and slice the flesh away from the pit. Cut into bite-sized cubes and place in a large mixing bowl.
Wash and dice the English cucumber into small cubes. Add to the bowl.
Rinse the blueberries and drain thoroughly before adding them to the bowl.
Cut the avocado in half, remove the pit, and dice the flesh into cubes. Add to the salad mixture.
Gently fold the fruit and vegetables together using a spatula.
In a small bowl, whisk together the olive oil, lime juice, honey, salt, and black pepper until fully combined.
Pour the dressing over the salad.
Toss gently to coat all ingredients evenly.
Sprinkle chopped cilantro over the top and fold lightly.
Serve the Mango Cucumber Salad immediately or chill for up to 1 hour before serving.