I was snorkeling from the Westin side of Black Rock and returning from a great swim. I was hugging the rock face and looked to my left and saw this huge ray. I immediately clicked record on my GoPro and swam towards the ray. It was gliding through the water and when it saw me, it picked up the pace a bit. I closed to about 50' away and held my breath as long as possible to get the footage. I was primarily looking for green sea turtles, but this was icing on the cake of a great swim.