I brought both my iPhone and a GoPro. I didn’t have any luck with my phone. It was too hard to keep it tucked away (so I didn’t hit the Manta Rays) and try to take pictures. The go pro was much easier strapped to my wrist to manipulate and get a few videos and pictures. The pictures are grainy compared to a high-level camera, but the videos featured in this post are from the go pro and I think they turned out nicely.