Instead of using the sun’s natural light indirectly, try including the sun in your photographs.
You can also use the sun as a back light by angling your camera up.
Try posing your friends in the shot with straight legs, arms or both to create a strong image.
The closer to blocking out the sun entirely will result in these types of shots. You will typically see less detail.
Angle the sun a bit further to the side for these types of shots so you can see more detail and colour.
Bear in mind, none of the shots were taken with an underwater flash.
Don’t forget to try a selfie!